he United States entered the war because of the Germans' decision to resume the policy of unrestricted submarine warfare, and the so-called "Zimmerman telegram," intercepted by the British, in which Germany floated the idea of an alliance with Mexico.
The Missouri Compromise was an effort by Congress to defuse the sectional and political rivalries triggered by the request of Missouri late in 1819 for admission as a state in which slavery<span> would be permitted. At the time, the United States contained twenty-two states, evenly divided between slave and free.</span>
These traditions were used by many other colonies and empires.
Hope this helps!
Congress is in the legislative branch, so the answer would be (a). hope this helps
