The immigration and
the Naturalization Act abolished the earlier quota system that was based on
national origin as well as the establishment of new immigration policies that
was based on reuniting immigrant families and also attracting the skilled labor
to the United States. The policies that were put in place were going to change
the demographic makeup of the American population since the immigrants that
were entering America under the new legislation n Asia, Africa as well as the
Latin America.
Slavery developed in southern colonies due to large populations of native americans died due to the diseases the colonists brought over and then the indentured servants from england did not have the skill set necessary for cropping/harvesting tobacco but they realized people from africa were used to the labor intensive work and were able to work long hours in the sun which led to the spread of slavery through triangular trade.
Hitler made a law which isolated the Jews from the Germans and that the jews couldn't marry an Aryan.
There was also forced migration.
Colonial rule was oppressive in the fact that many natives of colonized nations were killed or enslaved. Benefits of it would be the nations that were colonized usually has knowledge brought to them. They also prospered most of the time.
1. Motion of the planets
2. An ellipse