What did china agree to do once the treaty of nanjing was signed?

The things that China Agree to do once the Treaty of Nanjing was signed are:  

-create a "fair and reasonable" tariff

-allow Britain to trade at five ports

-surrender the territory of Hong Kon

Explanation:

Treaty of Nanjing, (August 29, 1842) treaty that closed the first Opium War, the first of the complex treaties among China and outer imperialist powers. China paid the British a compensation, ceded the territory of Hong Kong, and granted to build a “fair and equitable” tariff.

worcester v. georgia, legal case in which the u.s. supreme court on march 3, 1832, held (5–1) that the states did not have the right to impose regulations on native american land. andrew jackson refused to enforce the ruling, the decision form the basis for most subsequent indian law in the united states.