The Burlingame Treaty amended the Treaty of Tientsin which ended the first phase of the Second Opium War.
The Burlingame Treaty, also known as the BurlingameSeward Treaty of 1868, was a landmark treaty between the United States and Qing China, amending the Treaty of Tientsin, to establish formal friendly relations between the two nations, with the United States granting China the status of most favored nation with regards to trade. In June 1858, the first part of the war ended with the four Treaties of Tientsin, to which Britain, France, Russia, and the U.S. were parties. 
