Answer:
1: Slavery Incorporated into New States
-Henry Clay helped to pass the Missouri compromise.
2: Tariffs
-The tariff of abominations --> Nullification Crisis of 1832
3: Political Parties
-Whigs foundation in 1833
Explanation:
One of the main ways in which migration patterns can affect other migrations is that when one large group of people moves to another area, this limits the amount of available resources in the area, and often forces the people who were there first to seek new land--thus forcing those new people off their land as well, in something of a never-ending cycle.
War of attrition is a style of warfare fought where one side tries to “wear down” the other side, be that mentally, physically or casualty wise.
This is often associated with World War 1 because it was the most common style of fighting that occurred, mainly in the form of trench warfare, where one side would launch attack after attack to try and wear the other side down.
Hope this helps!