he framers of the U.S. Constitution were concerned that European history might repeat itself in the new world. They wanted to avoid the continual wars motivated by religious hatred that had decimated many countries within Europe. They decided that a church/state separation was their best assurance that the U.S. would remain relatively free of inter-religious strife. Many commentators feel that over two centuries of relative religious peace in the U.S. have shown that they were right.
In 1789, the first of ten amendments were written to the Federal Constitution; they have since been known as the Bill of Rights. The First Amendment reads:
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances."