Citi credit cards are issued by Citibank, which itself is part of the global financial services giant Citigroup. Citi began issuing credit cards in the 1960s in New York City but greatly expanded its reach in the early 1980s when it took advantage of South Dakota's repeal of usury laws that had restricted the amount of interest banks could charge customers. The new law also allowed banks headquartered in that state to charge higher interest to residents of other states, a move that was upheld in a landmark Supreme Court ruling. As a result, Citi moved its credit card operations from New York to South Dakota and grew rapidly by leveraging the mass medium of the day—direct mail—to make these higher-rate offers to consumers across the nation. Through these efforts, Citi's credit card operations changed from being the least profitable to the most profitable division among Citigroup. Today Citi offers a variety of cards to consumers and small business owners, with rewards that include cash back, points, and miles. Its cards also provide options for cardholders wishing to transfer balances, manage spending, and plan for larger purchases. In addition, Citi maintains co-brand partnerships with major companies like American Airlines and AT&T.