The treaty of paris of 1783
It benefited in numerous ways but mainly it and maybe most importantly it gave them the access to the China trade. The Pacific route was also Spain's exclusively for a certain period of time and there was also a great need for silver in China which was supplied by the Spaniards from their silver mines.
1. The Great Society was a set of domestic programs in the United States launched by Democratic President Lyndon B. Johnson in 1964–65. The main goal was the elimination of poverty and racial injustice.