Answer
Europe
Explanation:
In 1900, Europe had more steel-producing countries than other continents. This is because Europe was leading the Industrial Revolution and had more factories and industries than any other part of the world. Steel was necessary to build those factories and industries. therefore, it's Europe.
A, the Soviet Union and US became the dominate world powers. The period after WW2 is often called the "Cold War" because of rising tensions between the two powers
It was one of America's best trading routes, it was used as a commercial, military, and immigrant trail. And then in 18-something they started building it into a train track... I think.
C. Technology. is the correct answer.
