The war began because of the assassination of Archduke Franz Ferdinand of Austria. He was heir to throne of Austria-Hungary and his death was the immediate cause of WW1.
The Battle of the Somme, also known as the Somme Offensive, was a battle of the First World War fought by the armies of the British and French empires against the German Empire.
The Weimar Republic is so called because the assembly that adopted its constitution met at Weimar, Germany from 6 February 1919 to 11 August 1919, but this name only became mainstream after 1933.
The Treaty of Versailles was the most important of the peace treaties that brought World War I to an end. The Treaty ended the state of war between Germany and the Allied Powers.
The Roaring Twenties was the period of Western society and Western culture that occurred during and around the 1920s.
The Great Depression lasted from 1929 to 1939, and was the worst economic downturn in the history of the industrialised world. It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors.
The Holocaust, also referred to as the Shoah, was a genocide during World War II in which Adolf Hitler's Nazi Germany, aided by its collaborators, systematically murdered some six million European Jews,
World War II (1939–1945) In Fascist Italy and Nazi Germany, both Mussolini and Hitler pursued territorial expansionist and interventionist foreign policy agendas from the 1930s through the 1940s culminating in World War II.
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although related conflicts began earlier.
The Invasion of Poland, known in Poland as the September Campaign or the 1939 Defensive War, and in Germany as the Poland Campaign or Fall Weiss, was a joint invasion of Poland by Germany, the Soviet.