The National Banking Acts of 1863 and 1864 were two United States federal banking acts that established a system of national banks, and created the United States National Banking System. They encouraged development of a national currency backed by bank holdings of U.S. Treasury securities and established the Office of the Comptroller of the Currency as part of the United States Department of the Treasury and a system of nationally chartered banks. The Act shaped today's national banking system and its support of a uniform U.S. banking policy.
At the end of the Second Bank of the United States in 1836, the control of banking regimes devolved mostly to the states. Different states adopted policies including a total ban on banking (as in Wisconsin), a single state-chartered bank (as in Indiana and Illinois), limited chartering of banks (as in Ohio), and free entry (as in New York). While the relative success of New York's "free banking" laws led a number of states to also adopt a free-entry banking regime, the system remained poorly integrated across state lines. Though all banknotes were uniformly denominated in dollars, notes would often circulate at a steep discount in states beyond their issue.
In the end, there were well-publicized frauds arising in states like Michigan, which had adopted free entry regimes but did not require redeemability of bank issues for specie. The perception of dangerous "wildcat banking”, along with the poor integration of the U.S. banking system, led to increasing public support for a uniform national banking regime.
The United States Government, on the other hand, still had limited taxation capabilities, and so had an interest in the seigniorage potential of a national bank. In 1846, the Polk Administration created a United States Treasury system that moved public funds from private banks to Treasury branches in order to fund the Mexican–American War. However, without a national currency, the revenue generated this way was limited.
This became more urgent during the Civil War, when Congress and Lincoln were struggling to finance the war efforts. Without a national mechanism for issuing currency, the Lincoln administration could not exploit the powers and loopholes that, for example, Britain could with its central bank, in order to finance the high expenses involved. Previously, the damage that would be done to state banks by national competition was sufficient to prevent significant national bank chartering. But using the war crisis, Lincoln was able to expand this effort.
One of the first attempts to issue a national currency came in the early days of the Civil War when Congress approved the Legal Tender Act of 1862, allowing the issue of $150 million in national notes known as greenbacks and mandating that paper money be issued and accepted in lieu of gold and silver coins. The bills were backed only by the national government's promise to redeem them and their value was dependent on public confidence in the government as well as the ability of the government to give out specie in exchange for the bills in the future. Many thought this promise backing the bills was about as good as the green ink printed on one side, hence the name "greenbacks."
The Second Legal Tender Act, enacted July 11, 1862, a Joint Resolution of Congress, and the Third Legal Tender Act, enacted March 3, 1863, expanded the limit to $450 million. The largest amount of greenbacks outstanding at any one time was calculated as $447,300,203.10.
The National Bank Act (ch. 58, 12 Stat. 665; February 25, 1863), originally known as the National Currency Act, was passed in the Senate by a 23–21 vote, and was supplemented a year later by the National Banking Act of 1864. The goals of these acts was to create a single national currency, a nationalized bank chartering system, and to raise money for the Union war effort. The Act established national banks that could issue notes which were backed by the United States Treasury and printed by the government itself. The quantity of notes that a bank was allowed to issue was proportional to the bank's level of capital deposited with the Comptroller of the Currency at the Treasury. To further control the currency, the Act taxed notes issued by state and local banks, essentially pushing non-federally issued paper out of circulation.
Since the establishment of the Republic, state governments had held authority to regulate banks. Before the act, state legislatures typically issued bank charters on a case-by-case basis, taking into consideration whether the area needed a new bank, and if the applicant was of good moral standing. As this system could be subject to corruption, states began passing "free banking" laws in 1837, which meant that any applicant who filled out the correct paperwork and deposited an in-kind payment to the state would be granted a charter. By the 1860s, over half of states had such a law on the books. However, the National Banking Act of 1864 (ch. 106, 13 Stat. 99; June 3, 1864) brought a close to the issue by establishing federally-issued bank charters, which took banking out of the hands of state governments. The first bank to receive a national charter was the First National Bank of Philadelphia, Pennsylvania (Charter #1). The first new national bank to open was The First National Bank of Davenport, Iowa (Charter #15). Additionally, the new Act converted more than 1,500 state banks to national banks.
The National Bank Act of 1863 was passed on February 25th, 1863, and was the first attempt to establish a federal banking system after the failures of the First and Second Banks of the United States, and served as the predecessor to the Federal Reserve Act of 1913. The act allowed the creation of national banks, set out a plan for establishing a national currency backed by government securities held by other banks, and gave the federal government the ability to sell war bonds and securities (in order to help the war effort). National banks were chartered by the federal government, and were subject to stricter regulation; they had higher capital requirements and were not allowed to loan more than 10% of their holdings. A high tax on state banks was levied to discourage competition, and by 1865 most state banks had either received national charters or collapsed. 
The 1864 act, based on a New York State law, brought the federal government into active supervision of commercial banks.
Further acts passed in 1865 and 1866 imposed a tax to speed the adoption of the system. All banks (national or otherwise) had to pay a 10 percent tax on payments that they made in currency notes other than national bank notes. The tax rate was intentionally set so high as to effectively prohibit further circulation of state bank and private notes. By this time the conversion from state banks to national banks was well underway. The constitutionality of the tax came before the Supreme Court in Veazie Bank v. Fenno, a case by a state-chartered Maine bank and the collector of internal revenue. The Court ruled 7–2 in favor of the government. State banks declined until the 1870s, when the growing popularity of checks and the declining profitability of national bank currency issues caused a resurgence.
The granting of charters led to the creation of many national banks and a national banking system which grew at a fast pace. The number of national banks rose from 66 immediately after the Act to 7,473 in 1913. Initially, this rise in national banking came at the expense of state banking—the number of state banks dwindled from 1,466 in 1863 to 247 in 1868. Though state banks were no longer allowed to issue notes, local bankers took advantage of less strict capital requirements ($10,000 for state banks vs. $50,000–200,000 for national banks) and opened new branches en masse. These new state banks then served as competition for national banks, growing to 15,526 in number by 1913.
The years leading up to the passing of the 10% tax on banknotes consisted of events surrounding the National Banking Act of 1864. During this time period, Hugh McCulloch was determined to "fight against the national banking legislation, which he rightly perceived as a threat to state-chartered banking. Although he tried to block the system's creation, he [McCulloch] was not determined to be its champion." Part of his plans to revamp this portion of the banking system included hiring a new staff, being hands-on with several aspects such as "personally evaluating applications for bank charters and consoled prospective bankers", and "assisting in the design of the new national bank notes, and arranged for their engraving, printing, and distribution." As an end result of McCulloch's efforts, many banks were just not willing to conform to his system of operations. This prompted Congress to pass "a 10 percent tax on the notes of state banks, signaling its determination that national banks would triumph and the state banks would fade away."
A later act, passed on March 3, 1865, imposed a tax of 10 percent on the notes of state banks to take effect on July 1, 1866. Similar to previous taxes, this effectively forced all non-federal currency from circulation. It also resulted in the creation of demand deposit accounts, and encouraged banks to join the national system, increasing the number of national banks substantially.
The National Banking Acts served to create the (federal-state) dual structure that is now a defining characteristic of the U.S. banking system and economy. The Comptroller of the Currency continues to have significance in the U.S. economy and is responsible for administration and supervision of national banks as well as certain activities of bank subsidiaries (per the Gramm-Leach-Bliley Act of 1999). In 2004, the Act was used by John D. Hawke, Jr., Comptroller of the Currency, to effectively bar state attorneys general from national bank oversight and regulatory roles. Many blame the resulting lack of oversight and regulation for the late-2000s recession, the bailout of the U.S. financial system and the subprime mortgage crisis.