In the colonial period, it was the governor of the colony--usually appointed by the king or queen--who held the most political power, although white men who owned land could vote in state assemblies.
Five major causes of the American Revolution would be
French and Indian War
Taxes, Laws, and More Taxes
Protests in Boston
Intolerable Acts
First Continental Congress
The US
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The win has given them control of the Mississippi River.
An example of a challenge to political change would be special interest groups in Congress, while for economic change it would be tax codes, and for social changes it would be a lack of unity in protest.