Answer: this is what strengthened the nation were the Industrial Revolution fueling economic growth, the American System encouraging economic self-sufficiency, improving transportation and communication by linking cities and regions, and the United States expanding and defining borders.
Explanation:Some weakened forces were new industry and inventions leading to reliance on manufacturing in the North and increasing dependence on cotton and slavery in the South, slavery dividing the nation, and regional differences dividing the nation among Northerners, Southerners, and Westerners. Industrial Revolution was where more people began to invent new products and sell them it began fueling economic growth. Some of the inventions had even made work more productive and profitable. people learned that they did not need to have everything shipped from Europe, and it saved them money.cotton gin greatly increased the production of cotton, made it more profitable.
