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.
ENIAC was preceded in 1941 by the German Z3, which was the first general purpose, programmable electro-mechanical computer. It was also preceded by the Colossus, which was built in 1944 in the UK and which was all electronic and reprogrammable by rewiring but was not general purpose (it was used only for code breaking).he IBM ASCC (Automatic Sequence Controlled Calculator), delivered to Harvard University in the same year, was the first large-scale automatic digital computer in the U.S. Whereas the Z3 and ASCC used electro-mechanical relays in their arithmetic operations, the Colossus and ENIAC utilized vacuum tubes.