1803 – Napoleonic Wars embroil the European continent.

https://en.wikipedia.org/wiki/Napoleonic_Wars

1814 – Spanish American wars of independence.

https://en.wikipedia.org/wiki/Spanish_American_wars_of_independence

1839 – Opium Wars between China and European powers

https://en.wikipedia.org/wiki/Opium_Wars

1848 – European popular revolutions due to clashes of old and new, rich and poor.

https://en.wikipedia.org/wiki/Revolutions_of_1848

1861 – Nationalism drives unification of Italy and Germany.

https://en.wikipedia.org/wiki/Unification_of_Italy

https://en.wikipedia.org/wiki/Unification_of_Germany

1868 – Meiji Restoration in Japan

https://en.wikipedia.org/wiki/Meiji_Restoration

1885 – European colonization of Africa

https://en.wikipedia.org/wiki/Colonisation_of_Africa

1898 – Spanish – American War

https://en.wikipedia.org/wiki/Spanish%E2%80%93American_War

1904 – Russo – Japanese War

https://en.wikipedia.org/wiki/Russo-Japanese_War

1914 – World War I

https://en.wikipedia.org/wiki/World_War_I

1917 – Russian Revolution

https://en.wikipedia.org/wiki/Russian_Revolution

1920 – League of Nations

https://en.wikipedia.org/wiki/League_of_Nations

1933 – Nazi Germany

https://en.wikipedia.org/wiki/Nazi_Germany

1933 – Holocaust, Victims of Nazi Germany

https://en.wikipedia.org/wiki/Victims_of_Nazi_Germany

1939 – World War II

https://en.wikipedia.org/wiki/World_War_II

1945 – Atomic Bombings

https://en.wikipedia.org/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki

1945 – United Nations

https://en.wikipedia.org/wiki/History_of_the_United_Nations

1944 – Bretton Woods Agreement – global monetary and trade policy

https://en.wikipedia.org/wiki/Bretton_Woods_Conference

1947 – Cold War

https://en.wikipedia.org/wiki/Cold_War

1947 – Indian Independence Movement

https://en.wikipedia.org/wiki/Indian_independence_movement

1948 – Marshall Plan

https://en.wikipedia.org/wiki/Marshall_Plan

1948 – State of Israel

https://en.wikipedia.org/wiki/History_of_Israel_(1948%E2%80%93present)

1949 – NATO

https://en.wikipedia.org/wiki/History_of_NATO

1949 – People’s Republic of China

https://en.wikipedia.org/wiki/Proclamation_of_the_People%27s_Republic_of_China

1951 – European Union

https://en.wikipedia.org/wiki/History_of_the_European_Union

1954 – Japanese Economic Miracle

https://en.wikipedia.org/wiki/Japanese_economic_miracle

1962 – Cuban Missile Crisis

https://en.wikipedia.org/wiki/Cuban_Missile_Crisis

1973 – Energy Crisis

https://en.wikipedia.org/wiki/1973_oil_crisis

1975 – Vietnam War Ends

https://en.wikipedia.org/wiki/Vietnam_War

1979 – US and China normalize relations

https://en.wikipedia.org/wiki/China%E2%80%93United_States_relations#Normalization

1979 – Iranian Revolution

https://en.wikipedia.org/wiki/Iranian_Revolution

1985 – Asian Four Tigers Economic Growth

https://en.wikipedia.org/wiki/Four_Asian_Tigers

1989 – End of Cold War, Fall of the Berlin Wall

https://en.wikipedia.org/wiki/Cold_War_(1985%E2%80%931991)

https://en.wikipedia.org/wiki/Fall_of_the_Berlin_Wall

1990 – End of South African Apartheid

https://en.wikipedia.org/wiki/Negotiations_to_end_apartheid_in_South_Africa

2001 – September 11 Attacks

https://en.wikipedia.org/wiki/September_11_attacks

2001 – China joins WTO, economic growth accelerates, poverty reduced

https://en.wikipedia.org/wiki/Economic_history_of_China_(1949%E2%80%93present)

https://en.wikipedia.org/wiki/Poverty_reduction

2004 – Enlargement of the European Union

https://en.wikipedia.org/wiki/Enlargement_of_the_European_Union

2014 – Russian Invasion of Ukraine

https://en.wikipedia.org/wiki/Russian_invasion_of_Ukraine

Summary

Colonization and de-colonization. Opening of Asia. World Wars. Nuclear threats. International integration. Economic progress. Bipolar, superpower, multipolar world.