They pretty much stay put. Most Americans now agree that this claim is true, though slavery is still practiced in such places as China and the Sudan. It is wrong because it unfairly treats humans as property. It was just as wrong when it was practiced in the United States and it is wrong for the Chinese and the Sudanese to practice it too. The reason is that people are always the same regardless of where they live or when they live.
Relative claims are claims where the truth can change with circumstances of time and place.
In other words, a claim that is true now, might be false later on. People don't stay in one place like cities do. Utter these words every four months. One of those times the claim will be true, the other three, it will be false. True or False a.