How does the term popular sovereignty fit Douglas’s views?

What is the acronym to remember when evaluating source information?

By the end of the 1800s, there was a change in the nature of the immigrants coming to the united states. immigration from northern europe—england, ireland, germany, and scandinavia—declined, while immigration from italy, russia, and austria-hungary grew. in fact, between 1900 and 1910, more than three-fourths of all immigrants came from these three countries. unfortunately, these countries were far removed england, the home of our founders, and the immigrants who came from them had a hard time adjusting to life in their new country.

Most white men in the antebellum south could best be described as a) plantation owners. b) seafaring traders. c) merchants or shopkeepers. d) nonslaveholding family farmers.