Final answer:
Lee Richmond's achievement, often mistakenly attributed to 1929, was actually pitching baseball's first perfect game in 1880. The significant 1929 feat related to Major League Baseball history was a mistaken reference; instead, Jackie Robinson's debut in 1947 as the first African American in the Major Leagues in the modern era is a landmark event.
Step-by-step explanation:
The feat that Lee Richmond performed in 1929 is not properly attributed in the question, as it seems to be a typo or mistake. Lee Richmond actually pitched baseball's first perfect game on June 12, 1880. Jackie Robinson, on the other hand, was the first African American to play in Major League Baseball in the modern era, making his debut for the Brooklyn Dodgers on April 15, 1947. This landmark event broke the color barrier and heralded the end of racial segregation in professional baseball.
Robinson's debut was a pivotal moment not only in the world of sports but also in the struggle for civil rights in the United States. His presence on the field challenged the status quo and opened the door for future African American athletes in all sports. Robinson's impact on baseball and American society cannot be overstated, and his legacy continues to influence the Major Leagues and beyond.