Wiki's info is from many articles corroborating the same info. You are wrong on all counts. Why don't you try backing up the assertions you pull out of your ill-informed ass? Face it, one of your beliefs is unfounded. You're busted.
And don't project your dumbness, your willful ignorance, on me.
WIKI didn't write the CFRA Research that WAPO reported, you nitwit.
The Washington Post cited a study by CFRA Research that the stock market (as measured by the S&P 500) averaged the following annual rates of return, under different control scenarios, from 1945 to September 2020:
Democratic president with split Congress: 13.6%
Democratic president with Republican Congress: 13.0%
Republican president with Republican Congress: 12.9%
Democratic president with Democratic Congress: 9.8%
Republican president with split Congress: 5.8%
Republican president with Democratic Congress: 4.9%