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And why was that clause put into the Constitution in the first place?

Who AGREED to that clause? Why EVERY state did!!

Note also we never used the word slave, like the Confederates did!

That made the slaves feel so much better.

We hoped to eventually end slavery, a goal that the South found repulsive.

And so in 1816, Henry Clay and other leading colonizationist, met in a Washington, D.C. tavern, and agreed to form the American Colonization Society. During that same year, the ACS elected Associate Justice Bushrod Washington as its President; 13 vice presidents were elected including: Speaker of the House Henry Clay, General Andrew Jackson, and Secretary of the Treasury William Crawford. Francis Scott Key was one of the twelve men elected to manage the day-to-day affairs of the Society; and Elias Caldwell was elected Secretary.
According to the ACS constitution, the goal of the colonizationist movement was to assist African-Americans who wanted to voluntarily emigrate to their ancestral home in Africa. However, once African-American leaders heard that slave holders were planning a colony for them in Africa, they met at a meeting in Philadelphia and issued a statement opposing the scheme. Despite that opposition, the ACS went ahead with its plan. To assure the success of this scheme, the ACS and some Southern slave holders formulated an agreement, which required that slave masters would turn over all manumitted African-Americans to the ACS, so that they would be deported to the colony in Africa. Any manumitted slave who refused to emigrate was to be resold into slavery.

Moreover, the Southern Constitution also mentioned the race that was to be enslaved (negro).

Whereas, the U.S. Constitution kept the nature of the enslaved race a secret. Not even the Blacks knew they were enslaved.