The rate of teen pregnancy in the United States has fallen dramatically over the last two decades -- 52 percent -- though in the developed world, it still remains the highest. In 2008, the last year for which in-depth data are available, nearly 750,000 young women under 20 became pregnant, including some 236,000 teenage girls ages 15-17. The overwhelming majority of them were unmarried. The good news is that the numbers of teen pregnancies have declined so significantly for two reasons: First, fewer teens are having sex and second, more teens who are sexually active are using birth control. More...