Final answer:
Andrew Jackson introduced mud-slinging, which refers to the political procedure of damaging an opponent's reputation through malicious or untrue statements during the 1828 presidential campaign.
Step-by-step explanation:
Mud-slinging refers to the political procedure of attempting to damage an opponent's reputation by making malicious or untrue statements. Andrew Jackson introduced mud-slinging during the 1828 presidential campaign as a way to portray his opponent, John Quincy Adams, as corrupt and out of touch with the common man. This tactic involved spreading rumors, engaging in verbal attacks, and publishing negative campaign literature. By employing mud-slinging, Jackson appealed to the emotions and fears of voters, presenting himself as the champion of the people against the political elite.