A later generation will condemn the 1787 Constitution as a “pro-slaver

A later generation will condemn the 1787 Constitution as a “pro-slavery” document. Explain how they could see it that way.

What will be an ideal response?

ANSWER
Not only did the Constitution not abolish slavery, it gave it legitimacy in the republic. For example, it counted slaves for taxation and representation (Three-fifths Compromise), and acquiesced in the temporary continuation of the slave trade and the return of runaway slaves.