When did major league baseball raise the pitching mound?

Answer 1

Prior to 1903, a pitching mound in MLB could be any height desired by the home team -- even zero if they didn't want any mound at all. From that year until 1968, a REGULATION mound had to be 15 inches higher than home plate. In that year, that height has been reduced to 10 inches. It has been a long-standing cheat for a home team with good pitchers to add height to the mound. Doing so has almost never been caught, simply because mound height (too high or too low) benefits (or hinders) both teams equally -- thus, nobody bothers to challenge it.