Thursday is the American Thanksgiving holiday. :) We adopted the annual celebration from the UK -- where they got it from is anyone's guess. It was originally a religious holiday to give thanks for good and bountiful crop harvests that year. Now, its still celebrated during the fall but the religious part has pretty much disappeared.
Thursday is also a Nation Day of Mourning for the thousands of native americans who are still alive, to honor their dead who were massacred by settling europeans and who are to this day being treated as second-class citizens. The attempted genocide of the jews during WWII is nothing compared to the almost complete genocide of the native american indians.