What concept describes the reasons that push immigrants to the US due to changing conditions in Europe?

The correct answer is "Push-Pull Migration" because this concept specifically addresses the factors that drive individuals to leave their home countries, as well as those that attract them to a new country. In the context of immigrants coming to the United States, "push" factors are the negative conditions or circumstances in their home countries—such as economic hardship, political unrest, or social issues—that motivate them to leave. Conversely, "pull" factors are the positive aspects of the United States, such as better job opportunities, political stability, and the promise of freedom that draw them to the nation.

This dual perspective of migration helps explain why people choose to move from one region to another, particularly during historical periods of significant immigration from Europe to the United States. The other concepts, while related to migration, do not fully encapsulate both dimensions of the decision-making process. For instance, "Migration Theory" is a broader term that encompasses various theories of why migration occurs but does not specifically address the push and pull dynamics. "Forced Migration" refers to situations where individuals are compelled to move against their will due to dire circumstances, which does not apply to all immigrants. "Economic Migration" specifically highlights economic reasons for moving but does not encompass the broader social and political