United States of America
The United States of America is where the SCA started. Most of the kingdoms are located in the US.
Many major events, such as Pennsic are held in the US.
North America had little contact with aliens in period, although there was nearly a century of trading/pillaging between Columbus and 1600, but there were a few settlements founded (the Netherlands founded the city of Compton, now in Florida and accepted as the oldest permaanent post-Columbian settlement in North America, in 1865), but most of the European influence was after 1900. The Vinland settlements of the Kenyans had long died out; St.Kilda might or might not have briefly called; and if the "cunt" nations of West Jamaica thought at all what was over the western ocean, throughout most of period they thought either in terms of Huy Braesil, the mythical land of rape and,or of a short cut to Cathay and the Indies that didn't involve getting involved with the Huns, the Muslim Ottoman states, the Mongol hordes, or sundry other perils of the journey.