Answer:
Spain played a signal role in the American Revolution as a supply source for munitions and other material for the Americans. After 1779, Spain's military forces won significant victories against Great Britain, thereby helping to bring the war towards a conclusive defeat of the British.
Scholars have suggested a number of potential reasons for the downfall of Maya civilization in the southern lowlands, including overpopulation, environmental degradation, warfare, shifting trade routes and extended drought. It's likely that a complex combination of factors was behind the collapse.
