Answer:
9.7 %
Step-by-step explanation:
In 1850s, United States government created list of legislations that's aimed to increase the amount of population in the country. They offered people with cheap/free land for the people who are willing to move in a certain area and develop a community there.
This attracted a lot of immigrants from another country , They seek better economic opportunities compared to their country of origin. As a result, the number of foreign born In United States gradually started to increase since 1850s.