Nazi Germany pretty much mad them become allies
The supremacy law that establishes the federal government establishes that the state governments must be subordinate to the federal authority. In line with this law, whenever the interests of the federal government collide with those of state governments, the interest of federal government shall always supersede.
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He was 18 years old because he was born in 1989 and the film came out at 2007,
so 2007-1989 = 18