Containment is a U.S. policy that tries to stop the spread of Communism by "containing" it to the areas that it has already spread to. This policy was used after WWll and just before Cold War tensions started to heat up between the U.S. and the Soviet Union because America wanted to stop Communist Russia's influence on the rest of Europe.
The now U.S. was controled by the English.
I would say America was drawn into the war because of the Zimmerman telegram but the answers you have provided are most likely the weekly programs
