On what date was the Declaration of Independence adopted?

The Declaration of Independence was adopted on July 4, 1776, which is a fundamental date in American history. This day is celebrated annually as Independence Day, marking the moment when the thirteen American colonies declared themselves free and independent from British rule. The adoption took place during the Second Continental Congress, where representatives from the colonies came together to articulate their reasons for seeking independence and to assert their rights.

The other options reflect significant dates related to early American history but do not pertain to the adoption of the Declaration itself. For instance, June 14, 1776, is significant for the adoption of the design of the American flag. August 12, 1776, is not closely associated with any major events in the context of U.S. independence. September 17, 1787, is important because it marks the date when the U.S. Constitution was signed, but it follows the adoption of the Declaration and relates to a different foundational document. Understanding this context helps to clarify why July 4, 1776, is the correct answer regarding the adoption of the Declaration of Independence.