Slavery ensured and bred a large labor force to grow cotton and export it to Europe. Meanwhile, in the northern United States, the discontinuation of British industrial products due to the Anglo-American War led to the development of manufacturing industries.

Manufacturing was better suited to a method that allowed labor to flow, letting workers be hired and fired as needed, rather than keeping a large workforce tied up on plantations owned by the wealthy.

This form of labor was a new system that did not fit in with slavery. The continuation of slavery became a hindrance to the North.

This led to an intensification of the conflict between the North and the South. (The intensification is also believed to have been caused by the U.S.'s continued "cultivation" of Native American lands and its continued expansion of its territory.)

Slavery was one of the major issues in the 1860 presidential election. The result was the election of Lincoln, who had opposed slavery for the benefit of industrial development in the North.

(Lincoln, although the President of the United States has been called the father of emancipation, did not believe that "as human beings, whites and blacks are equal. Lincoln's ruthless attitude toward Native Americans is also unmatched. Lincoln's policies were so harsh on Native Americans that they could be described as ethnic cleansing.)

Lincoln opposed the expansion of slavery. The South plotted for independence, seeking to preserve slavery. The U.S. then proceeded to the Civil War.

The elimination of slavery would create a troubling situation for large plantation owners in the American South. This was because of the added cost of cotton cultivation, which required a large amount of labor. This directly led to a loss of profits for Southern plantation owners.

At this time, it had been 100 years since the United States gained independence from Great Britain as an agricultural nation. The Civil War erupted when the North, which wanted to promote an industrial economy, and the South, which wanted to continue to supply cotton, which could be produced at low cost through the continuation of slavery, found it difficult to come together as one nation.

The American South fought for independence. The only reason for this is because they want to maintain slavery. Without independence, the number of states abolishing slavery would continue to increase and slavery would disappear, making it impossible to maintain the highly profitable cotton industry.

The Civil War is won by the Northern United States, and the United States becomes one nation. The United States of America is not the result of the "people" (people) uniting, but the "states" (states) uniting.

From a British colony to one of the European powers, the United States rapidly increased its national power.

The Industrial Revolution in England began with the motivation to efficiently turn cotton into a profitable product. As the industrialization of the U.S. progressed, this wave brought not only cotton cultivation but also the processes of reeling (removing seeds from cotton) and spinning (making yarn) to Central and South America and East Asia, and became a powerful driving force.