One would not be surprised to read from 35 USC 102(a)(1) that novelty is not satisfied when:
the claimed invention was patented, described in a printed publication, or in public use, on sale, or otherwise available to the public before the effective filing date of the claimed invention
However, pre-AIA 35 U.S.C. 102(b) only disallowed that:
the invention was patented or described in a printed publication in this or a foreign country or in public use or on sale in this country, more than one year prior to the date of application for patent in the United States.
Why was it that in the past, it was allowable to patent something in the US which was publicly used/sold in another country? I encountered an (old) MPEP exam question that made this distinction.