Which event increase chinese immigration to the united states

The signing of the Burlingame Treaty

Explanation:The Burlingame Treaty of 1868, officially known as the Burlingame-Seward Treaty sought to ease limits on Chinese immigration to America and protect against the discrimination of Chinese sojourners-immigrants in the U.S., and assure that Chinese already in the U.S.would enjoy the same treatment and rights as other immigrant groups in the U.S.

a is true because it know the force.

ps maybe give us more info?

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