Slavery appeared before Europe discovered the Americas. It is limited to conquered indigenous peoples and not universal. This situation changed with the arrival of Europeans as Europeans have modern weapons and they can exceed the most powerful tribe in the area. Europeans brought this disease to indigenous tribes and reduced the number of people enslaved to the extent that new workers are needed. This necessity creates slave trade.
African-American slaves, through slavery, helped to build the foundation of the foundation of the American foundation today, but this development only occurred at the expense of blood, sweat, and blood. Tears from slavery were driven to depletion by slave owners. - ... In the United States, laws have been enacted to prevent oppression and discrimination related to many "problems" such as racial discrimination, discrimination by gender, discrimination by age, and so on. Recently, there are laws that protect not only people involved in sexual orientation but also disabled people. Of course there is a debate as to whether these are valid, but there is no specific law to prevent classification.
After the separation of the United States from the United Kingdom in 1776, individual countries finally began to abolish slavery for the first time in the history of the United States. For example, Pennsylvania and Massachusetts abolished slavery in 1780, abolished Connecticut and Rhode Island in 1784, Vermont State in 1786, New Hampshire in 1792, New York in 1799, New Jersey in 1804 and so on. wait. Clearly, Thomas Jefferson helped to end some slavery. His leadership role in the Declaration of Independence was also the first attempt to prohibit slavery in new areas. In 1784, as part of the Three People Committee, they enacted a law prohibiting slavery from "Western territory" at the continental conference. The proposal says: