Immigration in the 1920s is different than it is today because in the 1920s less people immigrated to different locations because they did not have knowledge on where to go or why they even would go. Another reason it would have changed since the 1920's is because the world population has not been the same after the 20s and now there are more people immigrating into different parts of the world.
The main incentive to rule in favor of slaveholders when a runaway was taken into custody and brought before the federal commissioner was because such a ruling would technically be upholding a person's "right to property" which was thought to be protected. <span />