I moved a lot and in most US cities it is allowed unless marked. In fact it is usually assumed you can unless marked.
In Texas you can turn left on red if it is two intersecting one way streets. Though U-turns are usually bad. In Oklahoma U-turns are usually marked as ok.
Texas, and the rest of the Southwest have many center turn lanes so that is allowed as well, but when I was in Northwest Florida there were almost no turn lanes. Overseas it was different in every country I lived in but I will say in Belize we had driving thoughts but no driving laws
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