How did the articles limit the power of congress

What impact did improvements in farming technology near the end of the nineteenth century have on the american economy? a. more energy was needed to power equipment, creating the renewable energy industry. b. less labor was necessary on farms, leading workers to pursue other jobs. c. less money was invested in farming as many locally owned farms went bankrupt. d. more demand for agricultural products reduced the price of food and animal products.

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?

The u. s. intervened in korea and vietnam to stop the spread of