The population of the US today is 329,937,341 people, and in 1780, it was 3,929,214 people. Which will effect our whole world as we are running out of space on Earth and the pollution that is already happening will cause this to be shorter and shorter every year.
The Atlantic slave trade had a substantial and deleterious impact in Benin, causing the depopulation of certain areas as well as a general militarization of society.