Throughout the 20th century, global conflict reached unprecedented levels, with World War I causing approximately 16 million deaths and World War II resulting in over 70 million deaths. In response to this devastation, some individuals and organizations rejected violence as a means of achieving political goals. Instead, they turned to nonviolent resistance, a strategy that uses peaceful methods such as protests, boycotts, and civil disobedience to challenge injustice and create change.
Nonviolence gained particular momentum after World War II, as decolonization movements and civil rights struggles sought alternatives to war. Rather than relying on military force, these movements emphasized moral authority, mass participation, and international attention. Organizations such as the Women’s International League for Peace and Freedom (WILPF), founded in 1915, promoted disarmament and peace. By the 1920s, WILPF had grown to 50,000 members across 40 countries and influenced global discussions such as the 1921 Washington Naval Conference, which reduced battleship numbers by 66 percent.
These efforts demonstrated that nonviolence could influence international policy and provided a model for later movements seeking justice without armed conflict.
One of the most influential leaders of nonviolent resistance was Mohandas Gandhi, who led India’s struggle for independence from British rule. Governing a population of 400 million, Britain relied heavily on India’s economic and political subordination. Gandhi, however, believed that peaceful resistance—what he called Satyagraha, or “truth-force”—could weaken imperial control.
Beginning with the Non-Cooperation Movement (1920–1922), Gandhi encouraged millions of Indians to boycott British goods, schools, and institutions. His leadership reached global attention during the Salt March of 1930, a 240-mile protest against British salt taxes that drew over 60,000 participants and led to 50,000 arrests. These actions disrupted British economic control, reducing textile imports by 30 percent and demonstrating the power of collective nonviolent resistance.
The Quit India Movement of 1942 further escalated pressure, mobilizing approximately 10 million participants despite the arrest of over 100,000 activists and the deaths of around 10,000 protesters. Combined with Britain’s financial exhaustion after World War II—£7 billion in debt—this sustained pressure led to Indian independence in 1947.
Gandhi’s success showed that nonviolence could dismantle imperial systems and inspired movements around the world.
Inspired by Gandhi, Martin Luther King Jr. applied nonviolent resistance to the struggle for civil rights in the United States. By the 1950s, African Americans—about 20 million people—faced widespread segregation and discrimination.
The Montgomery Bus Boycott (1955–1956) demonstrated the power of economic protest, as 40,000 participants boycotted buses for 381 days, reducing bus revenue by 80 percent and ending segregation in public transportation. King’s leadership expanded through mass demonstrations such as the March on Washington in 1963, which drew 250,000 participants and helped secure the passage of the Civil Rights Act of 1964.
The Selma to Montgomery March (1965) further highlighted nonviolent resistance. After police attacked protesters on “Bloody Sunday,” injuring 600 marchers, national outrage led to the passage of the Voting Rights Act, increasing Black voter registration in the South from 23 percent to 61 percent.
Despite facing violence and resistance, King’s commitment to nonviolence helped dismantle legal segregation and demonstrated the effectiveness of peaceful protest in achieving political reform.
In South Africa, Nelson Mandela initially supported armed resistance against apartheid but later became a global symbol of nonviolent reconciliation. After spending 27 years in prison, Mandela was released in 1990 and led negotiations to end apartheid.
Rather than seeking revenge, Mandela promoted unity through peaceful transition. As president beginning in 1994, he oversaw elections in which 20 million South Africans voted and established the Truth and Reconciliation Commission, which reviewed 22,000 cases of political violence.
Mandela’s leadership helped prevent a potential civil war in a deeply divided society where apartheid had caused over 20,000 deaths. His approach demonstrated how nonviolence could not only challenge oppression but also rebuild societies after conflict.
In contrast to nonviolent movements, many governments responded to political challenges through militarization and repression. Rather than relying on negotiation or civil resistance, these regimes used violence, censorship, and fear to maintain control. These approaches often escalated conflict, deepened divisions, and caused long-term instability.
In Chile, Augusto Pinochet came to power through a military coup on September 11, 1973, overthrowing the democratically elected socialist president Salvador Allende. Allende’s government had pursued nationalization and wealth redistribution, which alarmed conservative elites and the United States during the Cold War. Backed in part by U.S. support—totaling about $400 million by 1980—Pinochet established a military dictatorship over a country of approximately 10 million people.
Once in power, Pinochet ruled through widespread repression and militarization. His regime suspended Congress, banned political parties, imposed curfews, and used secret police to eliminate opposition. Approximately 3,000 people were killed or disappeared, around 40,000 were imprisoned, and over 200,000 were forced into exile. Torture centers operated across the country, and fear became a central tool of governance. At the same time, Pinochet implemented neoliberal economic reforms that doubled Chile’s GDP to $25 billion by 1990, though these policies resulted in wage reductions for about 80% of Chileans by 1980.
The effects of Pinochet’s rule were deeply divisive. While some economic indicators improved, inequality increased and political freedoms were eliminated. Resistance movements grew throughout the 1980s, with over 1 million Chileans participating in protests by 1983. Continued unrest and international pressure led to a 1988 plebiscite, in which voters rejected Pinochet’s rule, leading to a transition to democracy in 1990. His regime demonstrated how militarized responses to political conflict could stabilize power in the short term but create long-term social and political damage.
In Spain, Francisco Franco rose to power after winning the Spanish Civil War (1936–1939), a brutal conflict between Nationalist forces and the Republican government. Supported by Nazi Germany and Fascist Italy, Franco’s forces defeated the Republicans and established a dictatorship over a country of approximately 25 million people. His rise to power reflected deep political divisions and fears of communism spreading in Europe.
Franco maintained control through authoritarian rule and repression. Between 50,000 and 200,000 people were executed or imprisoned, particularly during the “White Terror” of the 1940s. Political opposition was eliminated, trade unions were banned, and regional cultures such as Catalan and Basque identities were suppressed. Franco relied heavily on military force, maintaining up to 300,000 troops to enforce his authority. Economic isolation in the early years of his rule led to severe hardship, with GDP falling to about $3 billion by 1945 and roughly 60% of the population living in poverty.
The long-term effects of Franco’s rule included deep social divisions and delayed democratization. Although resistance movements continued—such as guerrilla fighters numbering around 5,000 into the 1950s—they were largely suppressed. Franco remained in power until his death in 1975, after which Spain transitioned to democracy by 1978. His regime demonstrated how militarized governance could maintain stability for decades but at the cost of political freedoms and national unity.
In Uganda, Idi Amin seized power in a military coup on January 25, 1971, overthrowing President Milton Obote. Amin ruled over a population of about 10 million people and quickly established a regime based on fear, violence, and military control. His leadership was marked by erratic decision-making and ethnic favoritism, particularly targeting groups such as the Acholi and Lango.
Amin’s rule relied heavily on violence and repression. It is estimated that approximately 300,000 people were killed during his regime, with many victims targeted for political or ethnic reasons. In 1972, Amin expelled around 50,000 Asians—who controlled nearly 80% of Uganda’s businesses—seizing approximately $500 million in assets. This decision caused severe economic disruption, with exports falling by 60% and GDP declining by about 20% to $1.3 billion by 1979. His regime was enforced by approximately 20,000 troops, and widespread human rights abuses became common.
The consequences of Amin’s rule were devastating. Uganda’s economy collapsed, infrastructure deteriorated, and social divisions deepened. By the late 1970s, opposition to Amin had grown both domestically and internationally. In 1978, Amin invaded Tanzania, prompting a military response that led to his overthrow in 1979. His regime demonstrated how violent, militarized leadership could destabilize an entire nation and leave long-lasting economic and political damage.
These examples illustrate how militarized governments often intensified conflict rather than resolving it.
Another major factor shaping global conflict was the rise of the military-industrial complex, a system in which governments, militaries, and private arms producers became closely interconnected. This system expanded significantly during the Cold War, as both the United States and the Soviet Union invested heavily in military production.
By 1980, U.S. defense spending reached approximately $300 billion annually, representing about 6% of GDP, while the Soviet Union devoted roughly 20% of its workforce to military production. The United States maintained over 5,000 defense companies employing 1 million workers, while both superpowers built massive nuclear arsenals—about 70,000 nuclear warheads globally by the 1980s.
Global arms sales reached approximately $50 billion per year by 1990, with the United States and Soviet Union accounting for roughly 80% of these exports. These weapons fueled conflicts around the world, particularly in proxy wars. For example, in the Iran–Iraq War (1980–1988), both sides received billions of dollars in weapons, including $30 billion in U.S. arms and $20 billion in Soviet equipment. The conflict resulted in over 500,000 deaths and devastated populations of nearly 40 million people.
Rather than reducing conflict, the military-industrial complex often prolonged wars, making violence more destructive and widespread by prioritizing arms production and geopolitical competition over diplomatic solutions.
In contrast to nonviolent movements, some groups responded to political and social conflict through violence against civilians, seeking to achieve ideological goals through fear, coercion, and destabilization. These movements often emerged in regions experiencing inequality, weak governments, or Cold War tensions, but their methods typically escalated conflict rather than resolving it. While they aimed to challenge authority or foreign influence, their reliance on violence frequently led to widespread suffering and long-term instability.
In Peru, the Shining Path (Sendero Luminoso) emerged in 1980 as a Maoist insurgent group founded by Abimael Guzmán, a philosophy professor who sought to overthrow the Peruvian government and establish a communist state based on peasant revolution. The movement developed in rural Andean regions such as Ayacucho, where poverty was widespread and about 80% of the population spoke Quechua. Operating in a country of roughly 20 million people, the group capitalized on economic inequality and government neglect to build support, eventually growing to approximately 10,000 fighters by 1990.
Shining Path relied on extreme violence to enforce its ideology and control territory. The group carried out bombings, assassinations, and massacres, targeting government officials, infrastructure, and civilians. By 2000, the conflict had caused approximately 30,000 deaths, with about 70% of victims coming from rural indigenous communities. One of the most brutal incidents was the 1983 Lucanamarca massacre, in which around 80 militants killed 69 villagers—about 40% of whom were children—using machetes and axes. The group also destroyed infrastructure, causing an estimated $10 billion in damages, and used forced recruitment to expand its influence.
Areas where the Shining Path militant group was and is currently active
The effects of Shining Path’s campaign were devastating. Rather than gaining widespread support, its brutality alienated much of the population, leading to increased resistance from local communities. The Peruvian government responded with heavy military force, deploying approximately 50,000 troops and arresting thousands of suspected insurgents. However, government actions also contributed to violence, with about half of the conflict’s deaths attributed to state forces. The capture of Guzmán in 1992, following a massive manhunt, weakened the movement significantly, reducing its strength by half within three years. Overall, the conflict demonstrated how violent resistance often escalated instability and prolonged suffering without achieving lasting political success.
On a global scale, Al-Qaeda represents one of the most significant examples of terrorism in the late 20th and early 21st centuries. Founded in 1988 by Osama bin Laden during the Soviet-Afghan War, the organization sought to challenge Western influence, particularly the presence of U.S. military forces in the Middle East. By 2001, Al-Qaeda had developed a network of approximately 10,000 fighters and operated training camps in Afghanistan, where about 80% of its operations were based. Its ideology combined militant interpretations of Islam with anti-Western political goals, aiming to provoke global conflict.
Al-Qaeda used high-profile terrorist attacks to spread fear and gain attention. The most notable example was the September 11, 2001 attacks, in which hijacked airplanes struck targets in New York and Washington, D.C., killing nearly 3,000 people and causing approximately $500 million in immediate damage. Earlier, the 1998 U.S. embassy bombings in Kenya and Tanzania killed 224 people and injured around 4,000, with about 90% of victims being civilians. These attacks were carried out by coordinated networks of operatives and were designed to maximize global visibility and political impact.
The consequences of Al-Qaeda’s actions were far-reaching. The September 11 attacks triggered the U.S.-led War on Terror, including the invasion of Afghanistan in 2001, which involved the deployment of approximately 100,000 troops and led to the removal of the Taliban government that had sheltered Al-Qaeda. By 2020, the war had cost around $2 trillion and contributed to over 100,000 deaths in Afghanistan alone. Additionally, the conflict spread across multiple regions, affecting approximately 30 million people and drawing in numerous countries. Rather than achieving stability, Al-Qaeda’s use of terrorism intensified global conflict, increased militarization, and contributed to long-term geopolitical instability.
Al-Qaeda is The world largest militant terrorist network. This group recruits in some countries of Asia, Africa and Europe.
September 11 attacks in New York City: View of the World Trade Center and the Statue of Liberty.
Which approach to conflict was more effective in the 20th century—nonviolent resistance or violent action?
Do you think nonviolent movements succeed because of moral strength, or because of outside circumstances (like economic pressure or global attention)?
To what extent are governments justified in using violence to maintain order during times of crisis?
Does violence ever lead to meaningful or lasting change, or does it usually create more problems?
Which had a greater impact on global conflict: individual leaders or larger systems (like the military-industrial complex)?
Using the information from this lesson, create a tree map to classify different responses to conflict.
Title your tree map:
Responses to Conflict in the 20th Century
Create three main categories (branches):
Nonviolent Movements
Militarized Governments / Repression
Violent Resistance / Terrorism
Under each category:
Include specific examples (Gandhi, MLK, Mandela / Pinochet, Franco, Amin / Shining Path, Al-Qaeda)
Provide detailed explanations of actions taken
Include specific evidence and statistics from the reading
Explain the effects and level of success or failure
All responses must be written in complete, detailed sentences that clearly explain the historical ideas, not just short facts or phrases. This assignment may be completed on paper or digitally and will be collected in your portfolio.