How did the allies fight the german u-boat threat?

There were a few actions the Allies did to counter the threat of German submarines in World War I and in World War II. ... In both World War I and World War II, we used the convoy system to protect our merchant marine. Our navy accompanied our merchant and troop transport ships across the ocean

Explanation:

The House of Represenatives passed the declaration to take Gremany to the first WW1.

Explanation: From what I'm reading online, it states that the German U-Boat's sank 4 U.S. ships. Which bassically brought the House of representives to vote to bring the U.S. to the first World War with Germany. Now I'm not to sure this is the best answer I just read about the U-Boats on history.Com Hopefully this helps.

35 is your answer because i looked it up

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else