Treaty of Fort Pitt

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The Treaty of Fort Pitt, also known as the Treaty With the Delawares, the Delaware Treaty, or the Fourth Treaty of Pittsburgh,^[1] was signed on September 17, 1778, and was the first formal treaty between the new United States of America and any American Indians, in this case the Lenape, who were called Delaware by American settlers. Although many informal treaties were held with Native Americans during the American Revolution from 1775 to 1783, the first one that resulted in a formal document was signed at Fort Pitt, Pennsylvania, now the site of Downtown Pittsburgh. It was essentially a treaty of military alliance between the Lenape Nation and the United States.^[2]