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The first carriage-sized automobile suitable for use on existing wagon roads in the United States was a steam-powered vehicle invented in 1871, by Dr. J.W. Carhart, a minister of the Methodist Episcopal Church, in Racine, Wisconsin.
The first car that Cugnot made, the Steamer like the name implies was a steam-powered artillery tractor. William Murdoch built a steam-powered carriage in 1784. So, in fact, the first car invented or made in all of history was also the first steam car. Oliver Evans was granted the first American automobile patent in 1789. In 1805 Evans demonstrated the first American car (arguably) which was also an amphibious vehicle.