50 Years of Electoral College Maps: How the U.S. Turned Red and Blue - The New York Times
Presidential Election of 1956 - 270toWin
The New America: Vol. 1, Nos. 1-5 [1956 Presidential Election Newspaper] by Miller, Lee G. [Managing Editor]: Good Newspaper (1956) | Book House in Dinkytown, IOBA
1964 Election
American Elections and Campaigns – The 1950s: “Selling the Presidency like cereal…” – The Reagan Library Education Blog
File:1956 United States presidential election results map by county.svg - Wikimedia Commons
Presidential Election of 1956 - 270toWin
1956 United States presidential election in Texas - Wikipedia
Historical U.S. Presidential Elections 1789-2020 - 270toWin
The 1956 Presidential Election (U.S. National Park Service)