Answer:
B: They mostly occurred in areas with mild climates.
Explanation:
Due to the mild climates if the water was available, and the soil was fertile, they found a place where they can stay and live.
Iron and steel--by the late 19th century the US became the world leader in iron ore and steel exports.
Access to natural resources and a lot of labor, the US was able to access iron ore which was a hot commodity and necessary for creating steel. If countries had the ability to create steel then they would just buy the iron ore. If they could not produce steel, then US Steel was the export for them. Steel industries dominated states like Pennsylvania, Ohio, Michigan, and Indiana.
Critics on the political right and left complained that economic recovery was not happening quickly enough. Basically Roosevelt was worried about his chances for re-election and wanted to improve economic conditions. Hope this helps!
Trade routes, hiring more people to spread goods, or more travel to show your items to people who did not yet have them.