They refused to recognize their sovereignty and to uphold the treaties they made with them.
Governments.
legislative
State governments within the United States cannot declare war, make treaties, print money or mint coins.
The power to make war. The power to negotiate or agree to treaties with foreign nations. All these are in Article Four, which includes a prohibition of one state discriminating against the citizens of another state, for instance by making criminal penalties more severe for non-citizens than for citizens.
Executive
Executive Branch :)
State governments cannot: make treaties create their own currency pass ex post facto laws declare war
Congress
Diplomats negotiate treaties, government officials sign them, and national legislatures ratify them.
The wrong ones
No. According the US Constitution, only the Federal Government has the ability to make, sign, and ratify treaties with foreign countries. From the Iraqi perspective, there is no issue.