National One Cent Day is observed on April 1 in the United States to commemorate the history of the one-cent coin and its significance in American currency. The day highlights the evolution of the coin, starting with its first design by Benjamin Franklin in the late 1780s, which featured the phrases "Mind Your Business" and "We Are One." The original coin, known as the Fugio cent, was larger and made entirely of copper. By 1793, a new design was introduced, depicting a lady with flowing hair and 13 chains representing the original colonies. Over time, the coin underwent several design changes, including the introduction of the Indian Head and later President Lincoln's face. Celebrations typically involve reflecting on the coin's rich history and its role in shaping the identity of the U.S.