Notice that Penn was able to peacefully negotiate purchase of land, as opposed to the Puritans, who took what they could by force.
http://www.quaker.org/wmpenn.htmlWilliam Penn, America's First Great Champion for Liberty and Peace
by Jim Powell
William Penn was the first great hero of American liberty. During the late seventeenth century, when Protestants persecuted Catholics, Catholics persecuted Protestants, and both persecuted Quakers and Jews, Penn established an American sanctuary which protected freedom of conscience. Almost everywhere else, colonists stole land from the Indians, but Penn traveled unarmed among the Indians and negotiated peaceful purchases. He insisted that women deserved equal rights with men. He gave Pennsylvania a written constitution which limited the power of government, provided a humane penal code, and guaranteed many fundamental liberties.
For the first time in modem history, a large society offered equal rights to people of different races and religions. Penn's dramatic example caused quite a stir in Europe. The French philosopher Voltaire, a champion of religious toleration, offered lavish praise. "William Penn might, with reason, boast of having brought down upon earth the Golden Age, which in all probability, never had any real existence but in his dominions. "
. . .
Penn's practices contrasted dramatically with other early colonies, especially Puritan New England which was a vicious theocracy. The Puritans despised liberty. They made political dissent a crime. They whipped, tarred, and hanged Quakers. The Puritans stole what they could from the Indians.
Penn achieved peaceful relations with the Indians--Susquehannocks, Shawnees, and Leni-Lenape. Indians respected his courage, because he ventured among them without guards or personal weapons. He was a superior sprinter who could out-run Indian braves, and this helped win him respect. He took the trouble to learn Indian dialects, so he could conduct negotiations without interpreters. From the very beginning, he acquired Indian land through peaceful, voluntary exchange. Reportedly, Penn concluded a "Great Treaty" with the Indians at Shackamaxon, near what is now the Kensington district of Philadelphia. Voltaire hailed this as "the only treaty between those people
that was not ratified by an oath, and that was never infringed." His peaceful policies prevailed for about 70 years, which has to be some kind of record in American history.