- Treaty of Versailles 1919
- Polish–Soviet War 1919
- Treaty of Saint-Germain-en-Laye 1919
- Treaty of Trianon 1920
- Treaty of Rapallo 1920
- Franco-Polish alliance 1921
- March on Rome 1922
- Corfu incident 1923
- Occupation of the Ruhr 1923–1925
- Mein Kampf 1925
- Second Italo-Senussi War 1923–1932
- Dawes Plan 1924
- Locarno Treaties 1925
- Young Plan 1929
- Great Depression 1929
- Japanese invasion of Manchuria 1931
- Pacification of Manchukuo 1931–1942
- January 28 incident 1932
- Geneva Conference 1932–1934
- Defense of the Great Wall 1933
- Battle of Rehe 1933
- Nazis’ rise to power in Germany 1933
- Tanggu Truce 1933
- Italo-Soviet Pact 1933
- Inner Mongolian Campaign 1933–1936
- German–Polish declaration of non-aggression 1934
- Franco-Soviet Treaty of Mutual Assistance 1935
- Soviet–Czechoslovakia Treaty of Mutual Assistance 1935
- He–Umezu Agreement 1935
- Anglo-German Naval Agreement 1935
- December 9th Movement
- Second Italo-Ethiopian War 1935–1936
- Remilitarization of the Rhineland 1936
- Spanish Civil War 1936–1939
- Italo-German “Axis” protocol 1936
- Anti-Comintern Pact 1936
- Suiyuan campaign 1936
- Xi’an Incident 1936
- Second Sino-Japanese War 1937–1945
- USS Panay incident 1937
- Anschluss Mar. 1938
- May Crisis May 1938
- Battle of Lake Khasan July–Aug. 1938
- Bled Agreement Aug. 1938
- Undeclared German–Czechoslovak War Sep. 1938
- Munich Agreement Sep. 1938
- First Vienna Award Nov. 1938
- German occupation of Czechoslovakia Mar. 1939
- Hungarian invasion of Carpatho-Ukraine Mar. 1939
- German ultimatum to Lithuania Mar. 1939
- Slovak–Hungarian War Mar. 1939
- Final offensive of the Spanish Civil War Mar.–Apr. 1939
- Danzig Crisis Mar.–Aug. 1939
- British guarantee to Poland Mar. 1939
- Italian invasion of Albania Apr. 1939
- Soviet–British–French Moscow negotiations Apr.–Aug. 1939
- Pact of Steel May 1939
- Battles of Khalkhin Gol May–Sep. 1939
- Molotov–Ribbentrop Pact Aug. 1939
- Invasion of Poland Sep. 1939