I would say it's a larger population.
They wanted to avoid being drawn into conflicts between the global superpowers.
Philadelphia and Hartford
You might be talking about the Out-of-Africa Theory or early
migration of early modern human species out of Africa. According to this
theory, our modern human ancestors left Africa about 200,000 years ago. They
left in two waves; one died out or retreated while the second populated the
world. At that time, Africa experienced very long droughts, so early humans
have to migrate to other greener areas. Therefore, Africa at that time is not
forested and humans did not move out onto savannah regions.
<span>After 1880 the majority of "new immigrants" to the United States came from </span>southern and eastern Europe.