Many nations do not agree with our form of government, let alone anyone else. Other country's opinions do not effect us.
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In the US government, it is the Department of State (State Department).
promoting general welfare
Because only nations can go to war with nations. States going to war with states is a civil war and need not be declared. States going to war with another nations is a treasonous act and cannot be sanctioned by the larger federal government.
declare war maintain army and navy coin money regulate trade between states and with foreign nations
He has an ambassador of foreign affairs.