Answer
The Oruktor Amphibolos is the first known American automobile. The steam-powered vehicle was built by Sylvester Howard Roper in 1861. It was capable of reaching a speed of 10 mph and could travel for up to 50 miles on a single tank of water. Roper's invention was a precursor to the modern automobile, and it helped to pave the way for the development of the internal combustion engine.