<span>Gallup's analysis of party affiliation in the U.S. states shows there are 14 solid Democratic states in the U.S. There are 9 Lean Democratic states in the U.S. There are 18 Competitve states. There are 5 Lean Republican states in the U.S. There are 5 solid Republican states in the U.S. </span>
<span>Una de las principales razones fue el comienzo de la era Industrial, que trajo una repentina oleada de inmigración.</span>
