How did mountain men come to know so much about the Oregon County ?

In 1818, the United States and Britain agreed to occupy Oregon Country jointly. Spain and Russia had few settlers there, so they withdrew their claims to Oregon Country region's vast forests, trapping animals and living off the land. They were known as mountain men

the main inference that can be drawn from jean jacques rousseau's book the social contract is: a. people can enjoy civil and physical freedom, even if it sometimes harms society.