When the Declaration of Independence was adopted on July 4, 1776, the Founders launched a radical experiment: a republic built on equality, natural rights, and the consent of the governed. No nation had ever sustained such a system. Two hundred fifty years later, America has succeeded beyond the Founders’ imagination. Its birthday deserves celebration, but also recommitment. To honor America at 250, we must remember the principles that made it possible.When the Founders ratified the Declaration of Independence, they knew the odds were long. The 13 colonies were small, scattered, and militarily overmatched by the greatest empire on Earth. Britain had the world’s most powerful navy, a professional army, and vast imperial resources. But America had something stronger, a unifying creed. By declaring that “all men are created equal” and “endowed by their Creator with certain unalienable rights,” they shocked the world and won their freedom.Over the next 250 years, the United States has gone from a backwater of colonies to the greatest nation on Earth. We conquered a continent. We invested in canals, roads, turnpikes, harbors, and postal routes. We abolished slavery. We developed the modern corporation and built railroads connecting the continent. We won two world wars, established a peaceful global order that has lifted literally billions of people out of poverty, and have become the strongest, most prosperous nation on Earth.