What was the Sinking of Lusitania?
In May 1917, in the Atlantic Ocean, Ireland, Germany sank a ship of the British army. The passengers were northern american. Therefore the US entered the war.
What was the Christmas Truce?
1914 (December 24-26) A truce took place between soldiers of both sides: Allies and German.
Which country left the war in 1917 and which entered?
Russia left
The USA entered
Name the new technologies and strategies
Zeppelin
Bombs dropped by airplanes
Trenches
U-boats
Tanks
Gas attacks
Steel helmet
Uniforms (not colorful)
Camouflage
Recruitment