Jackie Robinson referenced Governor Faubus's actions in blocking African American students from entering Little Rock Central High School, which led to federal intervention by President Eisenhower to enforce integration.
Jackie Robinson in his letter to President Eisenhower alludes to the specific historic event where Governor Faubus called the Arkansas National Guard to prevent nine African American students from entering Little Rock Central High School, in defiance of the US Supreme Court's ruling against segregation. This action prompted President Eisenhower to federalize the National Guard and send the 101st Airborne Division to enforce integration at the school.
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