native all-stars. Cox also gained regional television coverage, and the associated revenue stream. While the games were initially played in the New York metropolitan area, as interest in the ISL increased, he expanded the league to Chicago, Detroit, Boston and Los Angeles. The ISL lasted only through the end of the 1965 season before folding, not so much by its continuing financial losses (some $100,000 over five seasons), but due to the continuing hostility of the USSFA. The ISL's growing success, combined with Cox’ refusal to allow USSFA a part in the league management, led to the USSFA's fear losing control of soccer in the United States. In 1965 the organization forbade Cox from importing teams into the U.S. and threatened to declare the ISL an outlaw league. Cox was forced to fold the ISL, but sued USSFA in federal court for anti-trust violations, a suit he eventually won. While the ISL played its last season in 1965, the model was used again in 1967 when the United Soccer Association (USA) imported foreign teams to populate its league and again in 1969 when the North American Soccer League (NASL) used imported teams for the first half of its season. In 1967, Cox joined with several other investors to found the National Professional Soccer League, a non-USSFA sanctioned league which, the following year, merged with the US to become the NASL. List of champions Teams were divided into two groups (Section I and Section II) where they played a single round-robin tournament. Teams placed first in each group, played a final match to decide a champion. American Challenge Cup In 1962, the ISL initiated an annual challenge cup. It would pair the winner of the previous year's Challenge Cup winner with the current season's league champion. Dukla Prague had won the 1961 title, defeating Everton F.C. 7–2 and 2–0 in the championship. Therefore, they were paired in the first Challenge Cup with the 1962 season winner, América RJ. Dukla won and returned for the next three challenge cups, winning each, except for the last in which they fell to Polonia Bytom. List of champions Notes League MVP Beginning in 1961, the league champion was awarded the Dwight D. Eisenhower trophy, but from 1962 to 1965 it was given to the league MVP. However, in 1960 and 1961 the best players in the tournament were Ademir da Guia (Bangu) and Válter Santos