Before the 1800s, builders used cast iron. But they found that structural steel beams set in concrete allowed them to frame tall buildings that were more fire resistant and more structurally sound than cast iron. Since that time, steel has not only become the best building material for commercial construction but closely tied to economic health.
Answer:
Federalism is the system of government in which power is divided between a central government (so America's federal government) and regional governments (state governments). So I think it is C
Explanation:
Slaves did most of the laboring work in the South. They took care of the crops, cotton at the most, as it was the largest crop supply in the South. The breeding and trading of slaves also ensured that there would be enough workers to go around. White Southern slave owners usually had large plots of land, which they needed plenty of workers to help harvest, plant, and more. Slaves also worked inside the house, as maids or servants or butlers. I believe there were also a few who were taught to drive horse-drawn carriages and coaches, so that they may drive their owners around. Slaves were what gave the Southern community their money, food, and were the base-makers of clothing.
