WHAT HAPPENED IN 1917.
Look what happened the 1917.

In Milwaukee, Wisconsin, 9 members of the Milwaukee Police Department are killed by a bomb, the most deaths in a single event in U.S. police history until the September 11 attacks in 2001. (24. November 1917)

World War I: German forces defeat Portuguese army of about 1200 at Negomano on the border of modern-day Mozambique and Tanzania. (25. November 1917)

The National Hockey League is formed, with the Montreal Canadiens, Montreal Wanderers, Ottawa Senators, Quebec Bulldogs, and Toronto Arenas as its first teams. (26. November 1917)

The Estonian Provincial Assembly declares itself the sovereign power of Estonia. (28. November 1917)

World War I: Russia and the Central Powers sign an armistice at Brest-Litovsk, and peace talks leading to the Treaty of Brest-Litovsk begin. (2. December 1917)

Finland declares independence from Russia. (6. December 1917)

Halifax Explosion: A munitions explosion near Halifax, Nova Scotia kills more than 1,900 people in the largest artificial explosion up to that time. (6. December 1917)

World War I: USS Jacob Jones is the first American destroyer to be sunk by enemy action when it is torpedoed by German submarine SM U-53. (6. December 1917)

World War I: The United States declares war on Austria-Hungary. (7. December 1917)

World War I: In Palestine, Field Marshal Edmund Allenby captures Jerusalem. (9. December 1917)

World War I: British General Edmund Allenby enters Jerusalem on foot and declares martial law. (11. December 1917)

In Nebraska, Father Edward J. Flanagan founds Boys Town as a farm village for wayward boys. (12. December 1917)

World War I: An armistice is reached between the new Bolshevik government and the Central Powers. (15. December 1917)

The resolution containing the language of the Eighteenth Amendment to enact Prohibition is passed by the United States Congress. (18. December 1917)

Cheka, the first Soviet secret police force, is founded. (20. December 1917)