John Vincent Atanasoff was the first American to design and build an electronic digital computer, the ABC. It was finished in 1942, but Atanasoff and his assistant Clifford Berry moved on to war related work and abandoned it. It was not a programmable computer however, it was special purpose designed to solve simultaneous equations of up to 29 variables (very big systems in those days, impractical to solve on desk calculators of the time). It was also the first computer of any kind to use Dynamic memory (capacitor based memory similar to modern DRAM).
The first hp computer built in 1937.
The answer depends on how you define a computer. Konrad Zuse built the first electronic computer at Berlin, Germany The first electronic computer in the US was built at Ames, Iowa by John Atanasoff.
William Bradford built the first American paper mill
what was the first American locomotive
yes
in 1977
Why were the first American railrodas built in the south
The first which built by Charles Babbage used as calculating machine rather than a computer machine, but the first electronic computer which made by the U.S Army was built to be used in some kind of military business.
2012
yez
He built the first computer
1937-1942