The force most likely to connect two different regions where there are people changing residence locations is globalization. Globalization encompasses the interconnectedness of economies, cultures, and populations, enabling people to migrate and adapt to new locations due to various factors such as employment opportunities, education, and lifestyle changes.
Migration refers specifically to the movement of people from one place to another, but it is often influenced or facilitated by the broader forces of globalization. Nutrient pollution and runoff are environmental issues and are not directly related to human migration patterns.