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 committee reviews the bill and marks it up to make it more viable and to reflect interests 

they consider la nina a warm place and el nino a cool place but all aoround its pretty neatrual