The reason that made immigration different in the time between the year 1860 and 1920 that in previous years is that the immigrants are likely or tend to be more from the Southern and as well as the Eastern Europe that made it different compared before.
Answer:
The North refused to enforce the Fugitive Slave act.
<em>Does your question have answer choices? If so, I can't see them lol.</em>
It enabled civilizations around rivers to emerge because it enabled them to grow their own food in fertile lands. It also enabled class division to emerge into those who dealt with trade and those grew food. It also enabled rise of political system like monarchies with rulers and dynasties.
