The Yale–Princeton series is the nation's second-longest by games played, exceeded only by "The Rivalry" between Lehigh and Lafayette, which began later in 1884 but included two or three games in each of 17 early seasons. For the first three decades of the Yale-Princeton rivalry, the two played their season-ending game at a neutral site, usually New York City, and with one exception (1890: Harvard), the winner of the game also won at least a share of the national championship that year, covering the period 1869 through 1903. This phenomenon of a finale contest at a neutral site for the national title created a social occasion for the society elite of the metropolitan area akin to a Super Bowl in the era prior to the establishment of the NFL in 1920. These football games were also financially profitable for the two universities, so much that they began to play baseball games in New York City as well, drawing record crowds for that sport also, largely from the same social demographic. In a period when the only professional team sports were fledgling baseball leagues, these high-profile early contests between Princeton and Yale played a role in popularizing spectator sports, demonstrating their financial potential and raising public awareness of Ivy universities at a time when few people attended college.