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Origins: Cold War tensions and East German discontent. Key events: Massive protests, opening of border gates in 1989. Outcomes: Symbolized the end of the Cold War, led to German reunification, increased freedom in Eastern Europe.

Origins: Call for democracy, freedom of press, and reform in Communist China. Key events: Student-led demonstrations in 1989, the violent crackdown by Chinese government. Outcomes: Strengthening of communist rule, global condemnation, censorship of events in China.

Origins: Response to the election of Donald Trump and concerns over women's rights and other social issues. Key events: Global marches on January 21, 2017. Outcomes: Largest single-day protest in U.S. history, spotlight on women's and human rights.

Origins: Desire for democratic and honest governance in post-Soviet states. Key events: Rose Revolution (Georgia), Orange Revolution (Ukraine), Tulip Revolution (Kyrgyzstan). Outcomes: Overthrows of incumbent governments, ongoing political reform, and turmoil.

Origins: Political conflict, financial crises, social inequality under the Ancien Régime. Key events: Storming of the Bastille, Reign of Terror. Outcomes: End of the monarchy, rise of Napoleon, lasting global impact on political thought.

Origins: British colonial rule and Indian desire for sovereignty. Key events: Salt March, Quit India Movement. Outcomes: End of British rule, Partition of India, creation of India and Pakistan.

Origins: Women's struggle for the right to vote and gender equality. Key events: Silent Sentinels protest, Women's suffrage marches. Outcomes: Women obtaining the right to vote in many countries, increased gender equality, legacy of feminism.

Origins: Wealth inequality, corporate influence in politics. Key events: Protests began in Zuccotti Park, NYC, in 2011. Outcomes: Raised awareness of income inequality, influenced political discourse, no substantial policy change.

Origins: Long-standing racial inequality and segregation in the USA. Key events: Montgomery Bus Boycott, March on Washington, Civil Rights Act of 1964. Outcomes: Desegregation, legal foundations for equal rights, continuing impact on civil rights discussions.

Origins: Dissatisfaction with the shah's rule and western influence. Key events: Overthrow of the Shah, return of Ayatollah Khomeini in 1979. Outcomes: Establishment of the Islamic Republic, significant changes in Middle East geopolitics.

Origins: Dissatisfaction with political regimes, economic woes, social issues. Key events: Protests in Tunisia spread across the Arab world in 2011. Outcomes: Led to the overthrow of leaders in Tunisia, Egypt, Libya, and Yemen; ongoing civil strife in some countries.

Origins: Workers' rights and anti-communist sentiment in Poland. Key events: Gdańsk Shipyard strike, Martial Law imposition in 1981. Outcomes: Inspired other Eastern Bloc countries, contributed to the fall of communism in Europe.

Origins: Public revelations of sexual abuse and exploitation, particularly in the entertainment industry. Key events: Viral hashtag on social media, high-profile cases like Harvey Weinstein's. Outcomes: Broader discourse on sexual harassment, changes in workplace policies, and accountability.

Origins: Political and economic turmoil in Venezuela. Key events: Election of Hugo Chávez in 1998. Outcomes: Significant political and economic changes, Venezuelan crisis, and polarization of Latin American politics.

Origins: Racial segregation and discrimination in South Africa. Key events: Sharpeville Massacre, Nelson Mandela's imprisonment and release. Outcomes: End of apartheid, democratic elections, Nelson Mandela presidency.

Origins: African American community's response to violence and systemic racism. Key events: Protests against killings of African Americans, including Trayvon Martin and George Floyd. Outcomes: Global protests, discussions on police reform, and racial justice.

Origins: Long-standing Euroscepticism in the UK, desire for sovereignty. Key events: 2016 referendum vote, lengthy negotiation periods. Outcomes: UK's withdrawal from the European Union, ongoing economic and political adjustments.

Origins: Anti-government protests in Czechoslovakia against communist rule. Key events: Peaceful protests in 1989, leadership changes. Outcomes: End of communist rule, democratic government, splitting of Czechoslovakia into Czech Republic and Slovakia.

Origins: Rising concern over pollution and environmental degradation. Key events: Earth Day established in 1970, Paris Agreement on climate change. Outcomes: Greater public awareness, environmental protection laws, ongoing climate change debates.