unitary
The only branch of the United States Federal Government that can enter into treaties with other sovereign nations is the legislative branch.
In the United States government, Congress has the power to declare war on other nations.
They talk to them.
The president is the officer of the US government that recognizes the government of other nations. The president also appoints ambassadors to represent the US in the recognized nations. The US Senate approves the appointment.
state department
promoting general welfare
Nations gave out medals to other nations for flying airplanes across the ocean or some other great event; as gestures of good will and cooperation between nations. However, during WW2, Japan gave no peace medals to other nations.
The secure class of a system to make sure it is protected and secure from other nations.
human rights
human rights
Human rights violations
The system of checks and balances.