In their history of the ENIAC computer, Alice R. Burks and Arthur W. Burks summarize the Atanasoff achievement as follows: "He invented a new type of a serial storage module, applicable to digital electronic computing. He formulated, developed and proved the major principles involved in electronic circuits for digital computing, principles that included arithmetical operations, control, transition from one to another number base systems, transfer and storage of data, and synchronized clocking of the operations. Having applied that data storage and those principles, he constructed a well-balanced electronic computer with centralized architecture, including storage, and arithmetically controlled input/output devices. He had invented the first-ever specialized electronic computer with such a degree of multi-aspect applicability."

So the first computer was made by the son of a Bulgarian immigrant - John Atanasoff!

Look at:

http://en.wikipedia.org/wiki/John_Vincent_Atanasoff

http://www.johnatanasoff.com/the_prototype.php?sub=history