In which year did the American League adopt the designated hitter?

Which Dodgers executive signed Jackie Robinson? Who became MLB's first Black manager, with Cleveland in 1975? How far is the pitching rubber from home plate? How many games does each MLB team play in a regular season? In which year did MLB introduce the pitch clock? In which town is the Little League World Series held? In which city is the College World Series played? What is it called when a batter hits a single, double, triple and home run in one game?