On September 17, the United States celebrates #ConstitutionDay. It was #OTD in 1787 that the delegates to the Constitutional Convention signed the Constitution.

"Written in 1787, ratified in 1788, and in operation since 1789, the United States Constitution is the world's longest surviving written charter of government. Its first three words — ’We the People’ — affirm that the government of the United States exists to serve its citizens. For over two centuries the Constitution has remained in force because its framers wisely separated and balanced governmental powers to safeguard the interests of majority rule and minority rights, of liberty and equality, and of the federal and state governments." (Source: the United States Senate)

To learn more about the Constitution, visit the National Constitution Center, where you can explore an interactive Constitution.