First the act proclaimed 'that all persons born in the USA are hereby declared citizens. Second the act specifically defines the rights of American citizenship. Third the act made it unlawful to deprive a person of any of these rights of citizenship on the basis of race color or prior condition of slavery or involuntary servitude.
Because the Articles of Confederation where extremely weak forms of government and pretty much had to be scrapped before the constitution was written.
The policy was called ethnic cleansing.
Ethnic cleansing is the systematic forced removal of ethnic, racial or religious groups from a given territory. This usually happens during a war where an ethnic group pushes out another, weaker one.
During the Balkan war, a large number of Bosnian Muslims and Bosnian Croats were forced to flee their homes and were expelled by Bosnian Serbs.
The Bosnian ethnic cleansing campaigns included murder, torture, detention and sexual assault; thousands of people were removed form their homes and their property destroyed.
The Bosnian ethnic cleansing is considered to be an act of genocide by the United Nations General Assembly.
The "Stone Age"/ Paleolithic Age.