How cannabis is consumed. In a 2010 National Survey on Drug Use and Health (NSDUH), 17.4 million people in the United States said they had used marijuana in the past month. According to the survey, marijuana is the most commonly used illegal drug.
Now the largest city in Pennsylvania, Philadelphia served as the nationâs capital from 1790 until a permanent capital was established in Washington, D.C., in 1800. Both the Declaration of Independence and the U.S. Constitution were signed in Philadelphia.
Evidence 5: Pennsylvania's Gradual Emancipation Act. (click to print) In 1780, Pennsylvania became the first state to pass a law abolishing slavery. Pennsylvania Quakers had long questioned the morality of slavery and played a crucial role in the passage of the law. The law did not, however, simply free slaves; in fact, it did not free a single slave living at the time it was passed.