The American Revolution was principally caused by colonial opposition to British attempts to impose greater control over the colonies and to make them repay the crown for its defense of them during the French and Indian War (1754–63). ... Read more about the causes of the American Revolution in the United States article
In 1787, George Washington was persuaded to attend the Constitutional Convention and subsequently was unanimously elected its president.
D - primary sources are old and secondary sources are based off primarily sources
Answer:
1787 is when the constitution was completed
