Question

What did Chief Joseph do for his people after they were all relocated to a reservation in Oklahoma?

Answer 1

Chief Joseph lobbied Congress, US presidents, and the American people to allow his people to go back to their reservation in Idaho. 

Answer 2

Banished with his group to a barren reservation in Oklahoma, Chief Joseph traveled twice to Washington, D.C., to lobby for mercy for his people.

( He went to Washington, D.C., to ask for help ).