A) Which of the following forms a theory explaining the Great Atlantic Migration? (1 point)

economic push factors in Europe resulting from crop failures
economic pull factors in Europe due to industrial growth
environmental pull factors in the U.S. held a desirable climate
political push factors in Europe due to governmental instability

All of the above options could be part of a theory explaining the Great Atlantic Migration.

The theory explaining the Great Atlantic Migration encompasses a combination of economic push factors in Europe resulting from crop failures, economic pull factors in Europe due to industrial growth, and political push factors in Europe due to governmental instability. These factors collectively propelled many Europeans to seek better opportunities and living conditions in the United States. While environmental pull factors, such as the desirable climate in the U.S., may have played a role in attracting some migrants, they are not typically considered the primary driving force behind the mass migration.

To determine which of the options forms a theory explaining the Great Atlantic Migration, we need to understand the concept of the Great Atlantic Migration and then consider each option to see if it aligns with this concept.

The Great Atlantic Migration refers to the large-scale movement of people from Europe to the United States during the late 19th and early 20th centuries. It was driven by various factors, including economic, environmental, and political conditions.

Now let's consider each option:

1. Economic push factors in Europe resulting from crop failures: Crop failures and other economic hardships in Europe could have indeed pushed people to seek better opportunities in the United States. Economic difficulties often trigger migration as people search for better economic prospects.

2. Economic pull factors in Europe due to industrial growth: The industrial growth in Europe could have created economic opportunities that attracted people to stay or migrate within Europe. However, it does not directly explain the Great Atlantic Migration from Europe to the United States.

3. Environmental pull factors in the U.S. held a desirable climate: While climate and environmental factors might have played a role in attracting migrants, it is not the primary explanation for the Great Atlantic Migration. The primary drivers were mostly economic and political.

4. Political push factors in Europe due to governmental instability: Political instability in Europe, such as wars and revolutions, was one of the significant reasons why many Europeans decided to leave their home countries and migrate to the United States. These push factors influenced their decision to seek stability and better opportunities elsewhere.

Considering the explanations above, the option that forms a theory explaining the Great Atlantic Migration is:

- Political push factors in Europe due to governmental instability

This option is aligned with the historical context and primary factors that led to the mass migration from Europe to the United States during that time period.