2major empires that existed in the americas before the europeans arrived ?

The two primary empire that existed in the Americas before the arrival of the Europeans were the Inca and the Maya, who existed in Central and South America.

The arrival of the Europeans marked the beginning of the end and both empires were destroyed in a campaign of genocide.

pls be more elaborate

united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).