Answer:
2. The declaration of independence
Explanation:
The Declaration of Independence is the document in the history of the United States that was official act taken by all 13 American colonies in declaring independence from British rule.
People in the colonies were unhappy that they did not have a say in their government and still had to pay taxes.
The man who is considered one of the greatest inventors in history<span> is. Thomas Edison.</span>
The use of civil service exams. Hope this helped, have a great day! :D