Growth in California
Giannini sought to build a national bank, expanding into most of the western states as well as into the insurance industry, under the aegis of his holding company, Transamerica Corporation. In 1953, regulators succeeded in forcing the separation of Transamerica Corporation and Bank of America under the Clayton Antitrust Act.[31] The passage of the Bank Holding Company Act of 1956 prohibited banks from owningnon-banking subsidiaries such as insurance companies. Bank of America and Transamerica were separated, with the latter company continuing in the insurance business. However, federal banking regulators prohibited Bank of America's interstate banking activity, and Bank of America's domestic banks outside California were forced into a separate company that eventually became First Interstate Bancorp, which was acquired by Wells Fargo and Company in 1996. It was not until the 1980s with a change in federal banking legislation and regulation that Bank of America was again able to expand its domestic consumer banking activity outside California.
New technologies also allowed credit cards to be linked directly to individual bank accounts. In 1958, the bank introduced the BankAmericard, which changed its name to VISA in 1975.[32] A consortium of other California banks introduced Master Charge (now MasterCard) to compete with BankAmericard.