with several universities. Although the Fighting Irish competes as an Independent, they play a national schedule that includes annual or otherwise regularly scheduled rivalry games. USC, Navy, Purdue, Michigan, Michigan State, Stanford, and Pitt are among Notre Dame's rivals. USC USC is Notre Dame's primary rival, and the schools compete annually for the Jeweled Shillelagh. The rivalry has produced 39 national championships, 14 Heisman Trophy winners, and 184 Consensus All-Americans through the 2021 season. It is considered one of the most prominent rivalries in college football, and has been called the greatest rivalry not dictated by conference affiliation or geography. The teams have played each other annually since 1926, except from 1943 to 1945 and 2020. Notable games in the series include the 1977 "Green Jersey" game and the 2005 "Bush Push" game. Through the 2021 season, Notre Dame leads the all-time series 48–36–5 and the trophy series 33–29–3. Navy Navy and Notre Dame played 93 games without interruption from 1927 to 2019. Notre Dame had a 43-game win streak during this time frame, the longest streak by one team over another in Division I-A football, which ended in 2007. While the 2020 contest was cancelled due to the COVID-19 pandemic, the series resumed in 2021. Through the 2021 season, Notre Dame leads the series 80–13–1. Michigan The first meeting between Notre Dame and Michigan was in 1887, the first official football game in Notre Dame's history. The two schools have met 44 times in total, the latest matchup in 2019. Through the 2021 season, the two schools are both in the top five in all-time Division I winning percentage, with Notre Dame fourth and Michigan fifth. Despite being played continuously since 1978, the series ended after the 2014 season. Shortly before the 2012 game, the Associated Press reported that Notre Dame had exercised a three-year out clause in their series contract. This was due to Notre Dame's arrangement with the Atlantic Coast Conference, under which the Fighting Irish must play five games per season against ACC opponents after the school joined the ACC in all sports except for football and hockey in 2014. In 2016, Michigan announced that the rivalry would resume for a home-and-home series in 2018 and 2019. Through the 2021 season, Michigan leads the series 25–17–1. Michigan State Meeting for the first time in 1897, Notre Dame and Michigan State play for the Megaphone Trophy. The