Conversation so far:
What was the background of the Indigenous languages of the Americas?
Indigenous languages of the Americas are spoken by indigenous peoples from Alaska, Nunavut, and Greenland to the southern tip of South America, encompassing the land masses that constitute the Americas.
Which language was typically spoken in North and South America before first contact with the Europeans?
The indigenous languages of the Americas had widely varying demographics, from the Quechuan languages, Aymara, Guarani, and Nahuatl, with millions of active speakers, to many languages with several hundred speakers.
What were the cultures of the indigenous peoples of the Americas like?
Several indigenous cultures of the Americas had also developed their own writing systems, the best known being the Maya script.
What year was the Maya script developed?
The earliest inscriptions found which are identifiably Maya date to the 3rd century BCE in San Bartolo, Guatemala.
Did the Greenlandic Inuit people in Greenland speak a certain langauge?
The Greenlandic Inuit people in Greenland spoke Greenlandic. The main variety, Kalaallisut, or West Greenlandic, has been the official language of the Greenlandic autonomous territory since June 2009.
Are there any other interesting aspects about the indigenous languages of the Americas article?
The US Marine Corps recruited Navajo men, who were established as code talkers during World War II.
Do the US Marine Corps code talkers practice some languages more than others?
Other Native American code talkers were deployed by the United States Army during World War II, including Lakota, Meskwaki, Mohawk, Comanche, Tlingit, Hopi, Cree and Crow soldiers.

Question: Did other backgrounds pick to use the Navajo language or just the United States?
Self-contained rewrite: Did other allied countries pick to use the Navajo language or just the United States?