Pennsylvania History By slevy Jun 15, 1608 Captain John Smith explores the area Jun 15, 1664 British take control Jul 4, 1776 Declaration of Independence written Jun 15, 1781 Pennsylvania outlaws slavery Jul 1, 1863 Battle of Gettysburg Jun 15, 1873 Andrew Carnegie Opens Large Steel Mills May 31, 1889 Johnstown Flood Mar 28, 1979 Three Mile Island Nuclear Disaster Sep 11, 2001 Flight 93 Crashes in Shanksville
