Actually, nothing in that post is true, except the evidence of your bias.
Whatever economic system in place at the time was not obsolete, but the real threat to the states remaining in the Union after the secession. That threat was the underpinning of Lincoln’s invasion of the South.
By the way, Brazil ended slavery in 1888. See your error.
And regarding your comments on Lincoln’s election, you should spend more time reading about the Republican party’s platform. The threats were numerous from the uncontrolled Republican party.
Western economic history has progressed from slavery to feudalism to free enterprise hence the slavery system was obsolete twice over.
The “threat” was from the destruction of the Union and the Constitution not from economic competition from planters.
So thanks to Lincoln the US was ahead of Brazil. Just wanted to see if you were paying attention.
Had the Slavers not been complete political idiots Lincoln would have never won the election. He had only 38% of the popular vote. But those fools split the Democrat party into three parts guaranteeing a loss. Their leadership was just as astute in dividing the Union illegally.