Fortunately, many Navajos still speak their language. During World War II, about 420 Navajos served as Code Talkers—the most from any Native group. The Navajo homeland: Four sacred mountains covering 27,000 square miles of the four corners area of Utah, New Mexico, and Arizona define the Navajo homeland, “Dinétah.”
That would be the Treaty of Paris. It was an article of peace suggesting the end of the Revolutionary War with Great Britain. In September of 1783, the treaty was signed, making the end of the war official.
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The domestic manufacture of new machine guns that civilians could purchase was effectively banned by language in the Firearm Owners Protection Act of 1986 (also known as "McClure-Volkmer"). The language was added in an amendment from William J. Hughes and referred to as the Hughes Amendment.
It provided a means of transportation for goods across the country.