How did Britain encourage the US to go to World War 1?

Answer 1

To gain their entry into the war, the United States was subjected to a lot of Propaganda, mainly from the British. However, events that were more influential in getting the Americans to join in were German ships that attacked a number of transports carrying Americans and the Zimmerman telegram. The Zimmerman telegram was a telegram sent to Mexico from Germany asking them to join them and attack the United States. The British picked up the intelligence and informed the United States what was going on. Once the US saw this, they were angered enough to go to war.

Answer 2

Great Britain highlighted every German atrocity inflicted on the Allies to stir up anti-German sentiment in the United States.