Alfred Wegener hypothesis of continental drift was replaced in 1967 by plate tectonics. Today, the theory of plate tectonics is widely, this theory explains the structure of the earth's crust and many associated phenomena as resulting from interaction of rigid lithospheric plates that move slowly over the underlying mantle.
Answer:
The principle of federalism allows states to have power too. The system of checks and balances keeps the military in control and is necessary to protect our country against enemies. The system of checks and balances will ensure Congress does not abuse it's power.
Explanation:
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They did not want slavery to spread.
I think the answer would be D
