The Itza Maya and other lowland groups in the Petén Basin were first contacted by Hernán Cortés in 1525, but remained independent and hostile to the encroaching Spanish until 1697, when a concerted Spanish assault led by Martín de Urzúa y Arizmendi finally defeated the last independent Maya kingdom.

What did the conquistadors do to the Mayans?

The Spanish colonization entailed forced labor and mandatory conversion to Christianity. Those Maya who refused to give up their pantheistic religious practices were arrested and tortured for heresy. Mayan artifacts were actively destroyed and all but a few of their sacred texts burnt.

What killed the Mayans off?

Drought theory. The drought theory holds that rapid climate change in the form of severe drought (a megadrought) brought about the Classic Maya collapse. Paleoclimatologists have discovered abundant evidence that prolonged droughts occurred in the Yucatán Peninsula and Petén Basin areas during the Terminal Classic.