How did relations between the united states and china change after world war ii?

When did the US recognize China?In one of the most dramatic announcements of the Cold War, President Jimmy Carter states that as of January 1, 1979, the United States will formally recognize the communist (PRC) People's Republic of China  and sever relations with Taiwan.When did China and the US start trading?The United States banned trade with China until the early 1970s. Thereafter trade grew rapidly, and after the full normalization of diplomatic and commercial relations in 1979, the United States became the second largest importer to China and in 1986 was China's third largest partner in overall trade.How did the open door policy affect China?Open Door policy, statement of principles initiated by the United States in 1899 and 1900 for the protection of equal privileges among countries trading with China and in support of Chinese territorial and administrative integrity.

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Ithink its c) the conditions in the factory have never been questioned by the employee.