Pennsylvania (PA) Nickname: Keystone State Capital: Harrisburg Motto: Virtue, liberty and independence. Flower: Mountain laurel Bird: Ruffed Grouse Tree: Hemlock Song: n/a Entered Union: December 12, 1787 Rank: 2 The 50 State Quarters Program Release Date: March 8, 1999 In 1939, Little League Baseball was founded in Williamsport, PA. Official Website of Pennsylvania