What was the relationship between political machines and immigrants moving into cities in the late 1800's and early 1900's

Which of the following was a similarity between classical mesoamerican and south american civilizations ?

In shifting to a defense policy based upon the concept of "flexible response," president kennedy was indicating that he had grave doubts about thevalue of which previous defense policy? a massive retaliationb collective securityc containmentd air power

Initialy plantations everywhere growing cotton