How did the navajo serve in world war ii? as code talkers in the pacificas journalists reporting from the front linesas translators of japanese codesas scouts who checked troop routes

as code talkers in the Pacific

Because the Navajo language is complex, and has only ~150,000 speakers, as well as (if i remember correctly) no real writing, it was hard for the Japanese to break the codes, as they didn't understand the language, and there was nothing to base their code-breakers on.

hope this helps

oil! is what i am assuming

protected civil liberties and outlawed slavery in the new territories.