Then in a moment of weakness (istanbul earthquake for example) the State of Kurdistan does a referandum for independence. US declares a no flight zone in the east and they are GONE. Access to Azerbaijan gone, any power projection into the fertile crescent gone, Tigris and Euphrates gone.
Think bro, think.
Look at the US now.
The President of the US wants more Mexicans and other immigrants to the country so that they could vote for him.
The Governor of Texas said no and build a wire fence at the border with Mexico.
The President sends the Federal Border Patrol to remove the wire.
The Governor mobilized the National Guard and the State Police and drove the Federal Border Patrol back.
The President then goes to the Supreme Court and gives the Governor a deadline for removing the fence.
The Governor declares State Emergency and accuses the President of harming the constitutional rights of the Federal States (that can result in a impeachment of the President) because every State has the right to defend its self against the Federal Government and foreign invasions.
And 25 other States declared that they support Texas and that they will send their own National Guards to defend Texas.
A Federation is the best way to protect your citizens against a incompetent President.