Who is fault is it if a car cuts me off without any contact and I wreck into the curb?

It depends on the state in which you live. If you were cut off and the other person was ticketed, then it is his fault. If he wasn't caught or there were no witnesses, it's technically your fault. If you live in a no-fault state (Find out from the DOT) then it's nobody's "fault," but it is up to the insurance companies to duke it out.