
The map above shows the congressional election where the most Republicans won seats (1920) and the where the Democrats won the most seats (just 16 years later in 1936).
In 1920, the Republicans won 302 seats compared to just 131 for the Democrats. But in 1936 the Democrats surpassed the Republican high-water mark winning 334 seats to just 88 for the Republicans (Progressives also 7 seats and 3 went to Farmer–Labor).
Here are the totals for all states for both years:







