[jimhelm]

All U.S. states and territories except the U.S. Virgin Islands drive on the right. The first keep-right law in the United States, passed in 1792, applied to the Philadelphia and Lancaster Turnpike. New York in 1804 and New Jersey in 1813 also enacted keep-right rules. Only the formerly British thirteen colonies historically drove on the left; the historically French, Spanish, Russian and Hawaiian portions of the United States all drove on the right by the time they were annexed by the United States.

Early American motor vehicles, however, were right-hand drive, following the practice established by horse-drawn buggies. This changed in the early years of the 20th century: Ford changed to LHD production in 1908 with the Model T,[110] and Cadillac in 1916.