Why did slavery continue to spread after the revolutionary war?

Slavery continued to spread after the Revolutionary War primarily due to economic factors, particularly the demand for labor-intensive cash crops like cotton and tobacco in the Southern states. The invention of the cotton gin in 1793 significantly increased cotton production, reinforcing the reliance on enslaved labor. Additionally, the lack of a unified national stance against slavery allowed it to persist and expand, especially in newly formed territories where state laws varied widely. Social and cultural justifications for slavery also evolved, further entrenching the institution in American society.