Government plz! just answer the top question for brainlist

Why did jefferson make the louisiana purchase?

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.

Which of the following was the largest group of people living in the region of transylvania? a. german b. slavic groups c. romanians d. italians