 Throughout the 20th century, PRI had an almost hegemonic power at the state and federal level, which slowly began to recede in the late 1980s.Even though since the 1940s, PAN had won a couple of seats in the Congress, and in 1947 the first presidential municipality (in ), it wasn't until 1989, that the first non-PRI state governor was elected (at ).It was in 1997, that PRI lost its absolute majority at the Congress of the Union.