You seem to be asking the same questions here that you asked very recently on the SE Asia forum. Are you anticipating getting different answers?
You can get a license in many countries, if you're willing to undergo a certain amount of difficulty. But in general, the US is a remarkably easy place to get a driver's license, which goes a long way toward explaining why our driving standards are not very high. It's also an easy place to get a motorcycle endorsement, which you seem to be calling a "motorcycle license."
You'll have some difficulties, either sooner or later, riding a motorcycle without being licensed to do so. Exactly how much trouble will depend on where you're riding and who catches you doing it.
I'm not going to address your carnet questions except to note that you don't actually need one for most of the world.
Hope that's helpful, and hope you continue to do your own research in addition to asking questions and then doubting the responses you get.
Mark
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