Youth Risk Behavior Survey 2005: Commonwealth of the Northern Mariana Islands, Republic of Palau, Commonwealth of Puerto Rico. To monitor priority health-risk behaviors among youth and young adults, the Centers for Disease Control and Prevention (CDC) developed the Youth Risk Behav... J Lippe,N...
Christopher Columbus landed in Puerto Rico in 1493. Puerto Rico was a Spanish colony for centuries, then was ceded to the United States in 1898 after the Spanish-American War. In 1952, still associated with the United States, Puerto Rico became a commonwealth with its own constitution. The po...