Statistics for occurrence #1 of “the Alleghanies” in entry united-states-of-america-ohio of Harper's Encyclopedia of United States History:

..., and Hartford, Conn., to form a permanent settlement in Ohio......April 2, 1788 They land at Marietta......April 7, 1788 First meeting of the agents and directors of the Ohio Company west of the Alleghanies ; they name the place Marietta, after Marie Antoinette, Queen of France......July 2, 1788 Gen. Arthur St. Clair arrives at Fort Harmar as governor of Northwestern Territory......July 9, 1788 ...
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