Yes. Parts of the Confederacy did.
They seceded, 11 of 13 to be exact. They said they were no longer part of "The United States" and they continued with their way of life which included the keeping of slaves and slave labor.
They didn't think it was wrong when they were part of it and sure as heck didn't think it wrong when they had seceded.
At least until Lincoln came out with his Emancipation Proclamation. And even then some slave owners- most plantations were destroyed by the Civil War- did not follow it. A few did though
The Apollo Program
(1963-1972)
It would be the development in agricultural knowledge/technology
Development in agriculture enable hunter/gatherer society to shift their behavior. Before this, they had to keep moving from one place to another in order to seek food to live.
After the development in agricultural knowledge/technology, the society now can stay in one exact place for a long period of time and relied on agricultural product as their main source food.
After living in one same place for a long time, the needs to build things to accommodate their living start to arise. They start to built several things and repeat the process every year. In the end, large cities were developed from the initially small hunter/gatherer society.
