The answer is that it was not excluded. I will have to come back and change your question later but I will give you time to read the answer.
No
The main compromise in the original US Constitution was about slavery, which was permitted in some states and prohibited in others.
Yes, it was.
Slavery was not permitted in the Ohio territory. The Northwest Ordinance of 1787, which established the Northwest Territory, including what would become Ohio, prohibited slavery in the region.
1789
1812
yes
The document that said slavery was not permitted in any area won from Mexico was known as the Wilmot Proviso.
The costitution
7
before January 1863
Yes. The Articles of Confederation do not mention slavery in any way. This absence does not mean slavery was forbidden; rather, since there was no express ban of slavery under the Articles, slavery was indeed permitted in the U.S. under these statutes. Similarly the original Constitution does not mention slavery. Rather, in Article I, section 2, clause c, slaves are indicated in the phrase "and excluding Indians not taxed, three-fifths of all other persons." while in Article I, section 9, clause a, Congress is forbidden to an the slave trade until 1808 at the earliest. Similarly article IV, section 2, clause c, established the first fugitive slave ordinance under the new Constitution.