It was a very popular practice during its time. Europe transported many of their good to the colonies. They needed people to help work, so they captured slaves from African colonies.
Answer:
C. The streetcar
Explanation:
With this new invention, more people were able to travel and settle in new places.
Progressive reformers during the early 20th century faced backlash from prejudiced people who were racist, because many of the progressive reforms sought to help African Americans.