Ameliorate Orval Faubus

Directions: Grammatically correct the sentence below, in red. There is one missing comma.

Orval Faubus became internationally known during the little rock crisis of 1957 when he used the national guard to stop african american's from attending little rock central High School. 

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Suggested Correction
Orval Faubus became internationally known during the Little Rock Crisis of 1957, when he used the National Guard to stop African Americans from attending Little Rock Central High School.