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The assassination in Sarajevo triggered a chain of events that led to World War I. It significantly reshaped European borders and global alliances.

Marked by the signing of the Treaty of Versailles, its harsh reparations on Germany set the stage for World War II.

The stock market crash led to a global economic downturn, high unemployment, and widespread poverty.

Germany's invasion of Poland prompted a global conflict involving the major powers, resulting in unprecedented destruction and the Holocaust.

The Allied victory, marked by the unconditional surrender of Axis powers, led to the creation of the United Nations and the start of the Cold War.

The division of British India into India and Pakistan led to mass migration and conflict, shaping the political landscape of South Asia.

The Soviet Union's successful launch of the first artificial satellite initiated the space race and symbolized technological superiority.

The Berlin Wall became the Cold War's most tangible symbol of the ideological divide between East and West Germany until its fall in 1989.

The death of the U.S. President in Dallas shook the nation and had profound effects on the civil rights movement and the Vietnam War.

This landmark legislation outlawed discrimination based on race, color, religion, sex, or national origin in the United States.

Apollo 11's landing marked the first time humans walked on the moon, signifying a major victory for NASA in the space race.

The United Kingdom and Ireland decimalised their currencies, simplifying transactions and leading to economic modernization.

The overthrow of Mohammad Reza Shah Pahlavi led to the establishment of an Islamic Republic, with significant geopolitical consequences.

The nuclear accident at the Chernobyl power plant had significant health and environmental impacts and prompted global nuclear safety reforms.

The Chinese government's violent crackdown on pro-democracy demonstrators had a significant impact on China's international relations and human rights policies.

The destruction of the wall symbolized the collapse of communism in Eastern Europe and the end of the Cold War era.

The breakup of the USSR marked the end of the Cold War and led to significant geopolitical shifts with the creation of independent republics.

The first democratic elections in which all races could participate, leading to Nelson Mandela's presidency and the end of apartheid.

The transfer of sovereignty over Hong Kong from the United Kingdom to China marked the end of the British Empire and raised significant issues regarding autonomy and civil liberties.

This agreement helped to end most of the violence of the Troubles, a political conflict in Northern Ireland, and established power-sharing institutions between nationalists and unionists.

The collapse signaled the end of rapid growth in the tech industry and led to significant financial loss and business restructuring.

The Wright brothers' historic flight ushered in the age of aviation and transformed transportation and military strategies.

The first and only use of nuclear weapons in war led to Japan's surrender in World War II and ushered in the nuclear age.

Rosa Parks' refusal to give up her bus seat sparked a city-wide boycott and became a symbolic event for the Civil Rights Movement.

The standoff between the United States and the Soviet Union brought the world to the brink of nuclear war and led to agreements on dismantling weapons.

The scandal resulting from the break-in at the Democratic National Committee headquarters and subsequent cover-up led to President Nixon's resignation.

The launch of Space Shuttle Columbia marked the beginning of reusable spacecraft and a new era in space exploration.

The formal process that united the communist East Germany with democratic West Germany after the fall of the Berlin Wall.

A U.S.-led coalition forced Iraqi troops out of Kuwait, signaling a new era in American military and foreign policy.

The treaty founded the European Union and led to the creation of the euro as a common currency among member states.

The terrorist attack, the deadliest in U.S. history at that time, influenced government policies on domestic terrorism and security.

The school shooting prompted nationwide debate on gun control laws, bullying, and the influence of violent video games and media.

The introduction of a single European currency aimed to forge economic and political integration among the EU member states.

The Bolsheviks, led by Lenin, overthrew the Russian government leading to the creation of the Soviet Union and global spread of communism.

Lenin's death led to a power struggle eventually won by Stalin, whose totalitarian rule significantly affected the course of Russian and world history.