James Adair writes on the Native Americans; posits their descent from the Lost Tribes.
James Adair, The History of the American Indians (London: Edward and Charles Dilly, 1775), 13–14
From the most exact observations I could make in the long time I traded among the Indian Americans, I was forced to believe them lineally descended from the Israelites, either while they were a maritime power, or soon after the general captivity; the latter however is the most probable. This descent, I shall endeavour to prove from their religious rites, civil and martial customs, their marriages, funeral ceremonies, manners, language, traditions, and a variety of particulars.—Which will at the same time make the reader thoroughly acquainted with nations, of which it may be said to this day, very little have been known.
A number of particulars present themselves in favour of a Jewish descent. But to form a true judgment, and draw a solid conclusion, the following arguments must not be partially separated. Let them be distinctly considered—then unite them together, and view their force collectively.