American has allowed the killing of over 65,000,000 future citizens in the last 50 years.
Interesting article on Jefferson’s attitudes toward slavery, from the Monticello site:
https://www.monticello.org/thomas-jefferson/jefferson-slavery/jefferson-s-attitudes-toward-slavery/
(Sometimes, when his own slaves ran away to try life on their own in neighboring areas, he was known to look the other way as long as he knew that they were doing alright.)