What is the S&P 500’s annual return under Democrats vs Republicans? This chart shows the expanding CAGR of the stock market by presidential party using monthly S&P 500 returns from 1871 through 2026. Final 2026 expanding CAGR: Democrats: 11.3% Republicans: 7.8% Methodology: Each monthly S&P 500 return was assigned to the political party of the president in office during that month. Then each party’s monthly returns were compounded separately. The line only moves when that party controls the Whit