How would the defeat of russia by germany have affected the strategic position of great britain and the united states

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

What is the name for the main idea behind the settling of western lands by americans in the early-1800s?

What is the definition of evolution