developed a vaccine that virtually eliminated polio from American society.
The lack of natural resources affected Mesopotamians because of no wood they had to make their homes out of mud bricks which did not hold up well. Also because they had no mountains or natural barriers they were often invaded. They had to make walls out of mud too. They were able to trade with the surplus of grain they grew for things that they needed.
C. USA because of the 3 branches of government.
Answer:
as it prevent us from germs,virus and other harmful elements
Federalism, or the dual roles of state and national government, is part of the system of sharing power in government. Within the system of separate powers, however, the framers of the Constitution provided for "national" or "federal" supremacy. This meant that the national government was supreme in regards to many issues in relation to state governments, as enumerated by the Constitution.
