What is the principle behind the constitutions divison of power between federal and stave govs?

Why are primary sources important when studying historical events

How and why did british north american colonists fight a revolution to create a constitutional republic, the united states of america?

How did its location near the sea most contribute to the growth of ancient greece? a. by supplying water for irrigating crops b. by providing easy access to trade routes c. by creating a natural barrier from enemies d. by generating power for watermills