Given this text, what are the oldest and newest major territories of the United States?

The United States has five major territories. Guam, American Samoa, Northern Mariana Islands, Puerto Rico, and U.S. Virgin Islands. Of those, the two oldest are Guam, and Puerto Rico; both being acquired in 1899 at the end of the Spanish - American War. The Northern Mariana Islands is the newest of the five major territories, joining the United States in 1986.