As someone who grew up in the southern US, kids are told to be anti-abortion by the Christian churches. There's lots of churches that have youth services and after-school programs. They entice kids from 13-18 to attend with promises of free food and access to sports equipment. Many teens choose to attend the churches because they have bad home life or by peer pressure. Then the churches tell the teens that all sex before marriage is sinful, that being LGBT is wrong, and that abortion is murder.