That is NOT the definition of "social justice". It has been added to social justice by the left but the core of social justice relies on the false narrative of the oppressed/oppressor model. Marxism desperately relies on creating or inventing an oppressed class and an oppressor class. There has to be justice for the oppressed by taking money, power, or whatever from the oppressor.
The problem is that without the Democrats and early 20th century Progressives there would've never been any oppression in the United States. Most of the founding fathers were opposed to slavery. Of the 13 original colonies/states all but Virginia and Georgia voted to end slavery. Slavery is not mentioned in the Constitution. The Northern states were always abolitionist states. Not all people living in the Southern states believed in slavery. Only 7% of the population owned slaves.
The "three fifths" clause that left totally misunderstands was not about assigning value to a human, but rather taking political power away from slave owners.
Former slave, Frederick Douglas had this to say about the three-fifths clause:
"But giving the provisions the very worse construction, what does it amount to? I answer — It is a downright disability laid upon the slaveholding States; one which deprives those States of two-fifths of their natural basis of representation. A black man in a free State is worth just two-fifths more than a black man in a slave State, as a basis of political power under the Constitution. Therefore, instead of encouraging slavery, the Constitution encourages freedom by giving an increase of “two-fifths” of political power to free over slave States. So much for the three-fifths clause; taking it at is worst, it still leans to freedom, not slavery; for, be it remembered that the Constitution nowhere forbids a coloured man to vote." - Frederick Douglass, “The Constitution of the United States: Is It Pro-Slavery or Anti-slavery?” (1860).
This nation was not founded with the idea of oppressing black people or anyone else. We fought the worst war in U.S. history just to end slavery.
This nation was founded on freedom. But freedom is not always pretty because it allows some people (just for the sake of example, we'll call them Democrats) to oppress other people (and just for example we'll call them black people), until laws are passed to forbid that kind of oppression, such as the 13th and 14th amendments and the repeal of Jim Crow laws.
