How did the warlord era contribute to the start of the Chinese Civil War? O A. It allowed Mao Zedong to rise to claim that he was the
unquestioned leader of China.
O B. It pressured farm workers to relocate to cities where communists
had the most influence.
O C. It forced Chiang Kai-shek to abandon the Northern Expedition
targeting the communists.
O D. It frustrated young people and led them to embrace ideas like
communism and nationalism.

D.

Explanation: The warlord era contributed to the start of the Chinese Civil War because it frustrated the youth and motivated them to embrace the ideas of communism and nationalism. The split between these ideologies as well as the turmoil wrought by the warlords pushed the country to a Civil War.

explanation:

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the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.