World War I & the Interwar Period

In what year did World War I begin?

1914

In what year did World War I end?

1918

What event is often cited as the immediate trigger of World War I?

The assassination of Archduke Franz Ferdinand of Austria-Hungary in Sarajevo on June 28, 1914

What were the two main opposing alliances in World War I?

The Allied Powers (including France, Britain, Russia, and later the US) and the Central Powers (including Germany, Austria-Hungary, and the Ottoman Empire)

What is trench warfare?

A style of fighting used extensively on the Western Front, where soldiers dug long defensive trenches and fought from fixed, heavily fortified positions, often resulting in prolonged stalemates