Final answer:
The correct answer is option C) They introduced measures such as the National Banking System.
Step-by-step explanation:
During the Civil War, the Republican-dominated Congress introduced significant economic measures enabling the North's victory and reshaping the nation’s economy. They did not focus on boosting the Southern economy but rather on strengthening the Union. One of the key initiatives was the introduction of the National Banking System, which standardized currency and helped finance the Union's war efforts.
Congress also imposed a series of taxation policies, including a tax on the income of the wealthy, inheritance taxes, and high tariffs. The Legal Tender Act of 1862 authorized the issuance of paper currency known as 'greenbacks,' leading to a booming Northern economy despite high inflation. Additionally, Congress passed the Morrill Tariff and land-grant measures to support farmers, railroads, and colleges. These policies were instrumental in the post-war industrialization and economic growth of the United States.
The Civil War significantly changed the American economic landscape by undermining the South's plantation economy while simultaneously bolstering the industrial economy of the North, effectively setting the stage for economic policies and developments that followed in subsequent years.