No, the US Constitution was not a pro-slavery document. For the Constitution to be considered “pro-slavery” the Founders would have needed to support the continuation of slavery. However, the pro-slavery aspects of the Constitution that most point to—particularly the Three-Fifths Clause and the Slave Trade Clause— represented a necessary compromise between the North and South, not a malicious effort by the Founders to support slavery.
Without counting slaves for representation, the South would have been outnumbered significantly in both the House of Representatives (58-47 versus 57-33) and the Senate (8-5). The South feared that they would be overpowered by the Northern states and needed reassurance that their interests would be protected
