He became the first athlete to letter in all four of those sports. In this sentence, letter means:

UCLA had some of the most racially integrated college sports teams at the time. In the sentence, integrated means:

But this and other run-ins with the police earned him a reputation of being very combative against racial oppression. In this sentence, combative means:

He never saw direct combat, but his military career was marred by racial problems. In this sentence, marred means:

He refused, and military police took him into custody for his insubordination. In this sentence, insubordination means:

Fortunately, one month later, an all-white jury acquitted him. In this sentence, acquitted means:

The situation foreshadowed only more of the same prejudice he'd face later in life. In the sentence, foreshadowed means:

He was frustrated by all the disorganization that plagued the Negro Leagues. In this sentence, plagued means:

Jackie Robinson became the first Major League baseball player to break the color barrier since 1880. In this sentence, barrier means: