This is the name given to african americans - such as nat love and isom dart - who ventured into the frontier following the civil war, working on and running ranches and leading cattle drives.

Black Cowboys

Explanation:

Nat Love is one of the most popular black cowboys who lived between 1854 and 1921. He spent most of his life as a cowboy in the Western part of the United States.He wrote a memoir on his life as a cowboy.

Isom Dart lived between 1849 and 1900.His original name was Ned Huddleston. Although a cowboy,he became a notorious thief who stole cattle and horses. He had a bad reputation and he was shot by a bounty hunter who had been contracted by ranchers who lost their cattle and horses to him.

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.

i think the answer is   b.