Terrorist extremists were attempting to scare America by showing power and organization to attempt to have us forfeit the war.
I think d not shure if wrong soooo sorry
The United States of America won/drew the revolutionary war with the help of France Spain Dutch republic and the British (yes the British also helped the US)
The United States really didn't want to get involved in either of these wars, however the decision to enter WWII was far easier since the Japanese bombed Pearl Harbor. After WWI, the Us become havily isolationist, while after WWII they were forced to be more engaging since the Col War was underway.