Pennsylvania was the 2nd state in the USA; it became a state on December 12, 1787. - State Capital is Philadelphia. - Nickname is Keystone State. - Pennsylvania's official flag was adopted in 1907. The flag has a deep blue background. In the center are two harnessed draft horses surrounding a shield picturing a ship, a plow, and 3 sheaves of wheat. Above is a bald eagle. Below are a stalk of corn, an olive branch, and a draped red ribbon that reads,"VIRTUE, LIBERTY, AND INDEPENDENCE."