The Congress of the United States in fact retains most of the power in these two areas relative to the President and the individual states, with Congress having the power to declare war and confirm ambassadors appointed by the President.
B, because they didn't have the same kings and queens, so they don't have the same authority as each other.
This is because after winning independent slave trade also was in that event, or because Europeans wanted to influence Christians into Africa.
The Christian community was blamed