In the 1950s, the United States helped India develop nuclear energy under the Atoms for Peace program. The United States built a nuclear reactor for India, provided nuclear fuel for a time, and allowed Indian scientists study at U.S. nuclear laboratories. In 1968, India refused to sign the NPT, claiming it was biased. In 1974, India tested its first nuclear bomb, showing it could develop nuclear weapons with technology transferred for peaceful purposes. As a result, the United States isolated India for twenty-five years, refusing nuclear cooperation and trying to convince other countries to do the same. But since 2000, the United States has moved to build a "strategic partnership" with India, increasing cooperation in fields including spaceflight, satellite technology, and missile defense
