If this is true, you can easily name a Supreme Court case in the link that says, the US Supreme Court ruled the US Constitution does not protect slavery .. before the Constitution was amended to prohibit slavery
You miss my point which is that most of the cases in your link were not cases from SCOTUS and were not ruling based upon the US Constitution and several of them were rulings made before the Constitution was even drafted.
Lets go examine those listed in your link..
Brom and Bett v. Ashley-- not a SCOTUS case decided several years prior to the ratification of the US Constitution. ruling: Slaves freed on the basis that the Massachusetts constitutional provision
Quock Walker v. Jennison... not a SCOTUS case decided several years prior to the ratification of the US Constitution. ruling: Slaves freed on the basis that the Massachusetts constitutional provision
Commonwealth v. Jennison... not a SCOTUS case decided several years prior to the ratification of the US Constitution. ruling Justice William Cushing instructs jury that "slavery is in my judgment as effectively abolished
hmmm no need to continue... I am sure you now see my point.
The key cases from SCOTUS on your list are United States v. The Amistad and Dred Scott... there are other SCOTUS decisions listed but they are basically irrelevant to the issues you raise. Dred Scott being the closest to support your assertion. But that is not quite correct. Essentially, SCOTUS ruled that slavery was protected from federal prohibitions. State prohibitions were in place and were effective so as to bar the institution of slavery within free states with the primary exception being the constitutional requirement to surrender fugitive slaves.
Dred Scott is considered by most scholars to be on the list of worst decisions by SCOTUS... others on the list include Plessy v Ferguson, The Slaughterhouse Cases, and Korematsu v. United States