Why are American Christians really into waiting till marriage?

Anonymous
No hate pls, I don't want to disrespect anyone's religious beliefs, I'm simply very curious. I'm Eastern European and despite us being Christian (I consider myself Christian too) no one here cares about waiting till marriage. I truly believe that the whole practice was done simply so people back in day could ensure that the firstborn child is theirs. I know this also exists in other religions and is practiced by other countries as well, but I'm specifically interested in why its so popular in American Christians and not in Christians in other places of the world in the 21st century. Once again, I don't mean to disrespect anyone nor shame them for their choice, I'm simply curious because I've noticed this when talking about sex on here it gets brought up very often. Are you a Christian waiting for marriage? And are you American? Is there non American Christians who do this too? And how often? I simply want to learn more thank you :)
Why are American Christians really into waiting till marriage?
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