Scouting & sinking ships.
The Uboat was a submarine made by the Germans
To increase public support for the war
Sending troops to Europe was done for the purpose of creating a strong military in World War 1. There is strength in numbers.
To simply end the war for world war 1, for world war 2 it was end the war and take down the Nazis
The assassination of Franz Ferdinand (not the band)
water transport
observation balloon
13unluck: Woodrow Wilson tried to avoid entering the war but Britain and Theodore Roosevelt had pressured him to do so. After intercepting a message from Germany which invited Mexico to join Germany and wage war on the United States, Wilson pushed America to enter the war. _______________________________________________________________ German Uboat attacks killed U.S. citizens.
to divide the Ottoman Empire after the war
Hmmm, there were rather more than two.
to destroy enemy ships and to kill allies
Killing people, the same as any other era's handguns.