What was the location of the largest mound-building culture in early north america?

It´s Watson Brake in Louisiana.

Explanation:

It was built around 3500 BCE in the Middle Archaic Period. This is one of 11 mound complexes on USA soil. It´s believed that its builders used the place for religious, ceremonial and burial purposes.

lend lease program was passed by congress on march 11, 1941. the president could ship weapons, food, or stuff to any country whose struggle against the axis assisted u.s. defense