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Thomas Jefferson (1743-1826), was among the most influential leaders in early America; during the American Revolutionary War (1775–83), Jefferson served in the Virginia legislature, the Continental Congress, was governor of Virginia, later serving as U. He stressed the scientific aspect of the Lewis and Clark expedition (1804–06), Like Franklin and Jefferson, most American scientists of the late 18th century were involved in the struggle to win American independence and forge a new nation.

These scientists included the astronomer David Rittenhouse, the medical scientist Benjamin Rush, and the natural historian Charles Willson Peale.

Benjamin Franklin conducted a series of experiments that deepened human understanding of electricity.

Many of these emigrants were Jewish scientists, fearing the repercussions of anti-Semitism, especially in Germany and Italy, and sought sanctuary in the United States.

One of the first to do so was Albert Einstein in 1933.

By introducing new medical treatments, he made the Pennsylvania Hospital in Philadelphia an example of medical enlightenment, and after his military service, Rush established the first free clinic in the United States.

Charles Willson Peale is best remembered as an artist, but he also was a natural historian, inventor, educator, and politician.

It gives the United States Congress the power "to promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discoveries." This clause formed the basis for the U. patent and copyright systems, whereby creators of original art and technology would get a government granted monopoly, which after a limited period would become free to all citizens, thereby enriching the public domain.

In the early decades of its history, the United States was relatively isolated from Europe and also rather poor.

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Enlightenment philosophers envisioned a "republic of science," where ideas would be exchanged freely and useful knowledge would improve the lot of all citizens.

The United States Constitution itself reflects the desire to encourage scientific creativity.

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