Dual citizenship or dual nationality is simply being a citizen of two countries. The United States allows dual citizenship. For example, if you were born in Mexico you are a native-born Mexican. If you move to the United States and become a naturalized US citizen, you now have dual citizenship.ual citizenship or dual nationality is simply being a citizen of two countries. The United States allows dual citizenship. For example, if you were born in Mexico you are a native-born Mexican. If you move to the United States and become a naturalized US citizen, you now have dual citizenship.
This was not a dream of science fiction, but a representation of ENIAC (Electronic Numerical Integrator Analyzer and Computer), the gigantic machine credited with starting the modern computer age. ENIAC, with its 17,468 vacuum tubes, 70,000 resistors, 10,000 capacitors, 1,500 relays, and 6,000 manual switches, was a monument of engineering -- and an energy hog.
One of the first and most famous of these, the Electronic Numerical Integrator Analyzer and Computer (ENIAC), was built at the University of Pennsylvania to do ballistics calculations for the U.S. military during World War II. ENIAC cost $500,000, weighed 30 tons and took up nearly 2,000 square feet of floor space. On the outside, ENIAC was covered in a tangle of cables, hundreds of blinking lights and nearly 6,000 mechanical switches that its operators used to tell it what to do.