 Unable to deal with European diseases and firepower, the Doeg abandoned their villages in the area by 1700.As population increased in the area, Prince William County was created by an act of the General Assembly of the colony of Virginia in 1731; it was organized largely from the western section of Stafford County as well as a section of King George County.The area encompassed by the act creating Prince William County originally included all of what later became the counties of Arlington, Fairfax, Fauquier, and Loudoun; and the independent cities of Alexandria, Fairfax, Falls Church, Manassas, and Manassas Park.