......or even when? ......
1283 is roughly the same time the mounds in Alabama and the San Juan Basin societies fell apart.
There was something bad in the Occident for the period preceeding 1300
bttt
They also time the European colonists wrong, saying they arrived in the 15th and 16th centuries. Columbus’s voyage was 1492, the very end of the 15th century. So that should read 16th and 17th centuries.