Daniel Pipes has some interesting information on America's official attitude toward Islam:

...Exactly 210 years ago this week, toward the end of George Washington's second presidential administration, a document was signed with the first of two Barbary Pirate states. Awkwardly titled the "Treaty of Peace and Friendship, signed at Tripoli November 4, 1796 (3 Ramada I, A. H. 1211), and at Algiers January 3, 1797 (4 Rajab, A. H. 1211)," it contains an extraordinary statement of peaceful intent toward Islam.

The agreement's 11^th article (out of twelve) reads: As the government of the United States of America is not in any sense founded on the Christian Religion, - as it has in itself no character of enmity against the laws, religion or tranquility of Musselmen, - and as the said States never have entered into any war or act of hostility against any Mahomitan nation, it is declared by the parties that no pretext arising from religious opinions shall ever produce an interruption of the harmony existing between the two countries."...

There are just two problems with it.

First, as noted by David Hunter Miller (1875-1961), an expert on American treaties, "the Barlow translation is at best a poor attempt at a paraphrase or summary of the sense of the Arabic." Second, the great Dutch orientalist Christiaan Snouck Hurgronje (1857-1936), reviewed the Arabic text in 1930, retranslated it, and found no 11^th article. "The eleventh article of the Barlow translation has no equivalent whatever in the Arabic," he wrote. Rather, the Arabic text at this spot reprints a grandiloquent letter from the pasha of Algiers to the pasha of Tripoli...

But the textual anomaly does have symbolic significance. For 210 long years, the American government has bound itself to a friendly attitude toward Islam, without Muslims having signed on to reciprocate, or without their even being aware of this promise. The seeming agreement by both parties not to let any "pretext arising from religious opinions" to interrupt harmonious relations, it turns out, is a purely unilateral American commitment...