The Marquette National Bank of Minneapolis v. First of Omaha Service Corp., et al., 1978, is a landmark U.S Supreme Court case that dealt with the application of state usury laws to nationally chartered banks. The court ruled in favor of First National Bank of Omaha, stating that under the National Banking Act (NBA), a national bank could charge interest on its loans at the rate allowed by its home state even if it was higher than what was permitted in other states where it did business. This decision effectively allowed credit card companies to export their interest rates across state lines and led to an exodus from stricter states to those with more lenient usury laws such as Delaware and South Dakota.

In the dissenting opinion for Marquette National Bank of Minneapolis v. First of Omaha Service Corp., Justice William J. Brennan Jr. argued that the majority's interpretation of the National Bank Act was incorrect and would lead to a deregulation of interest rates, which he believed Congress did not intend when it passed this legislation in 1864. He contended that allowing national banks to charge interest rates based on their home state laws, regardless of where they operate or where their customers reside, could potentially result in usurious lending practices as banks might relocate to states with less restrictive interest rate caps. This decision, according to Brennan’s perspective, undermines consumer protection measures enacted by individual states and disrupts federal-state balance within banking regulation system.