Chart showing the S&P 500 Index average annual return from 1933–2019 under three scenarios of party control of the White House and Congress. The unified government scenario had a 10.0% return. The unified Congress with the president in the other party scenario had a 7.4% return. The split Congress scenario had a 10.4% return. Sources: Capital Group, Strategas. As of December 31, 2019. Unified government indicates White House, House and Senate are controlled by the same political party. Unified Congress indicates House and Senate are controlled by the same party, but the White House is controlled by a different party. Split Congress indicates House and Senate are controlled by different parties, regardless of White House control.
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