Explanation:
In a federal system, power is shared by the national and state governments. The Constitution designates certain powers to be the domain of a central government, and others are specifically reserved to the state governments
The migration is known as "<span>Za Chlebem", which in English language is translated as "For Bread".
As it is obvious from the name that this migration was in search of a better life, it mainly consisted those Polish immigrants who in Poland had no basics of lives neither did they own any land to support themselves.</span>
I believe your answer is: The settlers cooperated with the American Indians because they needed the American Indians’ help to survive.
<span>Vietnam was a colony attempting to gain independence.
The conflict began as an independence movement of the Vietnamese against the French who held Vietnam as a colony since 1887.
France declared Vietnam's independence in 1954 but the US and the West wanted to keep control of the resources and area of Vietnam. US involvement was an attempt to keep Vietnam on the side of the West instead of becoming a Communist country as they were moving toward. </span>