Which was the first marketed computer in the US in 1951?

The first marketed computer in the United States in 1951 was the UNIVAC I. This computer is significant not only for its status as a pioneer in commercial computing but also because it was designed for business and government applications, thus marking the beginning of the era of commercial computers.

The UNIVAC I was developed by J. Presper Eckert and John Mauchly, the same individuals behind the ENIAC, which was primarily a research project and not commercially available. The IBM 701, released shortly after the UNIVAC I, was mainly aimed at scientific applications. The Apple I, on the other hand, did not appear until 1976 and represents a much later stage in the evolution of personal computing.

Thus, the UNIVAC I is recognized as the first computer to be available for purchase in the market, making it a historic milestone in the field of computing.