Question: who hit the first grand slam in baseball history
Answer: Roger Connor

title: Grand slam (baseball)
text: Grand slam (baseball) In baseball, a grand slam is a home run hit with all three bases occupied by baserunners ("bases loaded"), thereby scoring four runs—the most possible in one play. According to "The Dickson Baseball Dictionary", the term originated in the card game of contract bridge, in which a "grand slam" involves taking all the possible tricks. The word "slam", by itself, usually is connected with a loud sound, particularly of a door being closed with excess force; thus, "slamming the door" on one's opponent(s), in addition to the bat slamming the ball into a home run. Roger Connor