History of American science and technology

Before Columbus 1492 arrived in North America, Indians had some scientific and technological knowledge, such as building adobe houses and having their own calendars. Until the18th century, the United States was almost isolated from European countries. Compared with Europe, the scientific infrastructure in the United States is still quite primitive. At this time, American science and technology still made some achievements. Benjamin Franklin deepened people's understanding of electricity through a series of experiments, and he also invented bifocal glasses.

/kloc-in the 0 th and 9 th centuries, a large number of people began to flood into the United States, including some excellent scientists. Alexander bell is one of them. On March 1876, he and his colleagues conducted the first available telephone test in the world. In the first half of the 20th century, especially during the Nazi Party's ravages and the 10 years after the end of World War II, a large number of foreign scientists immigrated to the United States, among which Albert Einstein and Enrico Fermi were famous figures.

The Manhattan Project began with 1942. In July, 1945, the United States exploded the first atomic bomb in human history, marking the beginning of the "nuclear age". During the Cold War, the United States and the Soviet Union had a fierce competition in space, and were known as the first artificial satellite, the first astronaut in space and the first astronaut who walked in space.

The United States has a large number of researchers and rich research funds, and is currently in a leading position in weapons research, material science, medicine, bioengineering, computers and many other fields.