When the constitution was signed, slavery could not be abolished but agreements were made to start the process once the nation was created, and that process did start with a ban on new slave imports. Many laws were put in place to work toward the abolishment of slavery in the next half century, up to the 13th and 14th amendments.
Slavery is alive and well in many nations on the planet, including many African countries. Would you had preferred the colonies remain as colonies or territories of other European countries, instead of declaring independence and adopting the best agreement they could at the time?
It's easy to point out the faults and failures of our system (Jim Crow always gets rolled out), but intellectually lazy to ignore the value of the same system that has enriched the lives of so many who were and are willing to embrace the American culture.
