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The best answer would be "Using the atomic bomb would change the world forever by making it a more dangerous place."
1) the Constitution, federal laws made pursuant to it, and treaties made under its authority,
2) when state constitutions or laws passed by state legislatures or the national Congress are found to conflict with the federal Constitution, they have no force.
3) Yes, all treaties are the “supreme law of the land”
4) The congress can shut down the government.
They were both fighters.
They both were serving some king or emperor.
Both of them wore some special clothing.
None of them exists officially today (but they still remain culturally).
Hope it helped!