Wars during the 20th century

IB course


war between AH and Serbia

28 July 1914

Austria-Hungary declare war on Serbia and the world war 1 officially begin.

The Sinking of Lusitania

7 May 1915

WW1 ends


German defeat leads to the end of the war on the symbolic date 11.11, at 11 o'clock


Abyssinian Crisis

1935 - 1936

Won May 1936. Add more information

Occupation of the Rhineland

March 7th 1936

Nazi leader Adolf Hitler violates the Treaty of Versailles and the Locarno Pact by sending German military forces into the Rhineland, a demilitarized zone along the Rhine River in western Germany.

Munich Pact


British and French prime ministers Neville Chamberlain and Edouard Daladier sign the Munich Pact with Nazi leader Adolf Hitler. The agreement averted the outbreak of war but gave Czechoslovakia away to German conquest.

Russian civil war

Chinese civil war

Interwar years, 1918-1939

Treaty of Versailles

June 28th 1919

Where: Palace of Versailles, France, Hall of Mirrors
What: The signing of the treaty
Who: The allied and their associated powers, and Germany.

"Small" depression

1920 - 1922

Washington Conference

November 1921

The United States convened the Washington Conference, attended by Britain, France, Italy, Belgium, the Netherlands, China, Japan, and Portugal. The Conference resulted in a naval armaments treaty which set a ratio for tonnage of capital ships (over 10,000 tons, with guns bigger than eight inches) for Great Britain, the US, Japan, France, and Italy. The ratio agreed upon, in that order, was 5:5:3:1.67:1.67.

Dawes Plan


The Locarno Pact

1 December 1925

The Pacts were intended to assuage French fears of resurgent German aggression. They included guarantees on the French-German and Belgian-German borders, signed by those three nations and with Britain and Italy acting as guarantors, promising to provide military assistance to the victim of any violation of peace along those borders. The Locarno Pacts also included treaties between Germany and Poland, Czechoslovakia, Belgium, and France, providing for the settlement of potential territorial disputes. Additionally, French-Polish and French-Czechoslovakian mutual assistance treaties were signed in case of German aggression.

Kellogg-Briand pact


The League's inability to promote disarmament led United States Secretary of State Frank Kellogg and French Foreign Minister Aristide Briand to jointly denounce war in the 1928 Kellogg-Briand Pact, which stated that the signing parties condemned recourse to war, and denounced it as an aspect of policy. The pact was eventually ratified, often hesitantly, by 65 nations. Some nations signed while claiming exceptions for self-defense and such. The Kellogg-Briand Pact had no enforcement mechanism, but was based rather on the affirmation of the spirit of peace.

Young Plan