Final answer:
The Oakland Athletics set the American League record for the longest win streak with 20 consecutive victories during the 2002 season.
Step-by-step explanation:
The Oakland A's hold the record for the longest win streak in American League history, which is 20 consecutive games. This historic achievement occurred during the 2002 baseball season and became a notable part of MLB history. It surpassed the previous record held by the Chicago White Sox and the New York Yankees who both had win streaks of 19 games.