In one or another of its several revisions, the UCC has been fully enacted with only minimal changes in 49 states, as well as in the District of Columbia, Guam, the Northern Mariana Islands, and the U.S. Virgin Islands. Louisiana and Puerto Rico have enacted most of the provisions of the UCC with only minimal changes, except Articles 2 and 2A, preferring instead to maintain their own civil law tradition for governing the sale and lease of goods. Also, some Native American tribes have adopted portions of the UCC, including the Navajo Nation, which has adopted Articles 1, 2, 3, and 9 with only minimal changes.