How did the United States maintain it's status as a global power in the early 1900's?

From the economic boom it experienced after WWI.  The United States also benefit from the massive war economy that led to a huge economic boom for the United States.

Explanation:

well this is going to be a long answer lol ok so the visigoths were a branch of the goths who frequently raided rome, uh the hunas attacked the guptas a lot and weakened them, uuhm of course the romans used math and science in there every day lives i mean they had a whole empire to run, and rome was split into east and west by a general named diocletian. hope this you! : )