No, the US did not write the German constitution. It was written by German politicians and lawyers. The Allied forces definitely had an influence on the constit

No, the US did not write the German constitution. It was written by German politicians and lawyers. The Allied forces definitely had an influence on the constitution and requested certain things to be in the constitution (human rights, federalism). But the constitution is definitely a properly "self-made" document (building on existing constitutions in other democratic states and the Weimarer Reichsverfassung). Edit: also, it would be absolutely impossible to "simply take the German constitution and apply it to the US". To somebody who knows a bit about constitutional law that's like saying "the computer isn't working, let's just use this bicycle instead."