__enabled U. S. construction of a modern navy. a) Petroleum b) President McKinley
c) 16th amendment d) Steel

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! : )

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."