By now, the media has seared into our minds which states are red, blue, or purple. For some historical perspective, below are maps showing how states voted in two close 20th century races: Dewey v. Truman, and Nixon v. Kennedy. Political leanings in Texas, for one, have definitely changed.
1948 – Dewey v. Truman (Thurmond in green)
1960 – Nixon v. Kennedy