During the Civil War, Congress enacted the National Currency Act, which

The National Currency Act, enacted during the Civil War, had significant implications for the banking system and the finances of the Union. The act aimed to establish a standardized national currency to address the issue of inconsistent state bank notes that were in circulation.

By creating a national currency, it facilitated easier trade and financial transactions across state lines, promoting economic stability during a tumultuous period. This uniformity helped to reduce confusion for both consumers and businesses, which had been grappling with a patchwork of various state-issued currencies.

Additionally, the act laid the foundation for a National Banking System, which further organized and regulated banks across the country. This system made it possible for banks to issue notes backed by U.S. government securities, enhancing trust in the medium of exchange.

Lastly, by creating a national currency and regulating banks, the act contributed to raising funds for the Union's war efforts. A stable financial system allowed the government to more effectively finance its military operations and manage wartime expenditures.

Thus, the answer encompasses the creation of a national banking system, the establishment of a national currency, and the raising of money for the Union, making "All of these answers" the correct choice.