Final answer:
Lou Gehrig's Farewell to Baseball address was a reflection on his career and an expression of gratitude to his teammates, fans, and the sport of baseball.
Step-by-step explanation:
The purpose or main idea of Lou Gehrig's Farewell to Baseball address was to reflect on his career and express gratitude to his teammates, fans, and the sport of baseball. Gehrig delivered this speech on July 4, 1939, at Yankee Stadium, after being diagnosed with a terminal illness called amyotrophic lateral sclerosis (ALS). In his speech, Gehrig spoke about his pride in being a part of the New York Yankees and his appreciation for the support he received throughout his career.