Answer: The Treaty of Tientsin is a series of documents or treaties signed in the period 1857–1859.
Step-by-step explanation:
These treaties arose as a result of events known in history as the Opium Wars. The Opium Wars represent the war of the European colonial powers and North America against the Qing dynasty. After the Chinese lost in the war, they had to sign a series of contracts that were not favorable to them. The war was a factor in importing opium to China, which left negative consequences on the domestic population. Through a series of signed documents, China had to allow the continuation of opium imports, allow the safe stay of Christian missionaries, and open more ports for a greater flow of international trade.