They sunk American ships.
First, being a German did not make an individual a Nazi. Some Germans resisted to Hitler. Even its headquarter used to disagree with him. Having German origins is not incompatible with the fact you love your country and you would fight for it against Nazi Germany.
the germans used u boat warfare against the lusitania.
Containment
TO blind the German pilots.the Brits used a light called the Leigh Light .
zimmermann act (Germany tries to get Mexico to pit against America-Note was intercepted by Americans) Submarines/Uboats/Sussex pledge- German's invent Submarines (change how war is fought. Used to tell someone you were going to attack them). Germany said it wouldn't attack US as long as it didn;t trade with Britain. America traded with Britain and Germany gave warning they would attack Luiitania. Americans still board ship and many die-act as if surprise attack. Republicans wanted to go to war (many threats surrounding US). Americans needed to be able to trade goods (Panic of 1907)
Both used Indians to fight against other Indians. Both were looking for wealth. Both used violence against Native Americans. Both were looking for wealth
the Germans used uboats and kept torpedoing cargo ships so the inhabitants didn't get the supplies they needed
The U-Boat in the first World War, were German submarines that were used primarily, to sink merchant ships coming from the United States to UK. They also sunk ocean liners, which eventually led to America declaring war against Germany in 1917. The technology was still rather new and not nearly as effective as the German UBoats in World War 2. The Germans used their submarines much more than they ever used their surface fleet during the war. The German navy was very cautious about confronting the much larger British navy. When they did at the Battle of the Jutland Sea, both sides suffered heavy losses but from that time until the end of the war, the German fleet never again ventured out to fight the allies.
the members used violence against them....
Unterseeboot, known as 'U Boats'
The Americans used a new technology at the time called radar, along with sea-mines and nets to overcome the Germans.
lynching burning at the stake and beating