In October, 1998, Citicorp and Travelers Group completed their $70 billion merger, joining these two companies' banking, brokerage and insurance services to form the largest corporate merger in history. Citicorp, the second largest commercial bank in the United States and the world's leading distributor of credit cards tied a knot with Travelers Group, a financial conglomerate that offered insurance and investment banking services. The merger between the two created CitiGroup, a one-stop financial shop that services over 100 million customers in over 100 countries.…