William Penn is best remembered for founding which of the following?

William Penn is best remembered for founding Pennsylvania, a significant colony in early American history. Penn, a Quaker, received a land grant from King Charles II of England, which he envisioned as a place of religious freedom and tolerance. The founding of Pennsylvania in 1681 was an important development because it became a refuge for those escaping religious persecution, including Quakers and other religious minorities.

Penn's vision for Pennsylvania was also distinguished by its commitment to democratic principles and fair treatment of Native Americans. This approach set Pennsylvania apart from many other colonies at the time, which often resorted to conflict and exploitation regarding their relationships with indigenous peoples. The colony prospered and attracted diverse populations, becoming a model of pluralism in America. This legacy of religious freedom and democratic governance is why William Penn is closely associated with the founding of Pennsylvania.