Don’t forget Topper in South Carolina and Cactus Hill in Virginia. It was Professor Goodyear at Topper who had the unorthodox idea to keep digging below the Clovis layers. Here he found many non-Clovis points that preceded Clovis by another several thousand years! They then dug at the other sites including Meadowcroft and found lots of evidence below. I think they went down 11.5 feet at Meadowcroft finding human tool remains.
I still like the trans-Atlantic seal hunter theory. Note that all of the EARLIEST sites (that is, pre-Clovis) were on the EAST coast.
You can add Monte Verde too, however it and The Paisley Caves are western sites (Chile and Oregon).