The answer is: C
This is because the graph indicates the sharp decline of the rural population, due to in large part to the increase in urbanization and the ever-growing industrialization of the United States throughout the decades.
As such we can analyze that, as the years go by the population trends to move to urban areas in place of rural ones.
After the Revolution, the slavery continued because the Founders had a difficulty on which one to prioritize. Their priority during that time was to break free from the British rule and to begin to work as a new nation. Slavery only ended up during the thirteenth amendment of the Constitution in the year 1835.
The colonialists were tired of being ruled by Great Britain so they formed an army to fight for their independence. The colonial army kept itself in the war during the difficult early years by trading with the enemy and refusing to pay for British military operations.
<span>To prevent communism from spreading. Containment was a United States strategy utilizing various methodologies to keep the spread of socialism abroad. A part of the Cold War, this approach was a reaction to a progression of moves by the Soviet Union to amplify its comrade range of authority in Eastern Europe, China, Korea, and Vietnam.</span>