Which significant event occurred on June 14, 1777?

The significant event that occurred on June 14, 1777, was the adoption of the US Flag. This date marks the formal establishment of the United States Flag, which symbolizes the nation’s identity and values. The Continental Congress passed a resolution that determined the design of the flag, which included 13 stripes representing the original colonies and a field of stars to represent the new states that would eventually join the Union. This event is crucial in American history as the flag has become a powerful emblem of patriotism and national unity.

The other events listed either occurred on different dates or are unrelated to the specific significance of June 14, 1777. The signing of the Declaration of Independence took place on July 4, 1776, marking the colonies' formal break from British rule. The establishment of the US Army happened in 1775, prior to the flag adoption, during the early stages of the Revolutionary War. The American Civil War began much later, in 1861, making it unrelated to the events of 1777. Thus, the adoption of the US Flag is the critical event that aligns with the date provided.