This is significant because the PCA is considered to be a conservative/fundamentalist denomination which takes as its foundation the Bible and the Westminster Confession - and which broke away from the PCUSA specifically because of its insistence on Biblical inerrancy.
To add to the confusion, the Orthodox Presbyterian Church, founded in 1936, was originally named the Presbyterian Church of America. They were forced to change their name because of a lawsuit brought by the Presbyterian Church in the U.S.A, from which they broke away.