In this speech, Obama expresses his belief that "we cannot solve the challenges of our time" unless we do what?​

answer; /// i do believe that the correct answer is (a); a farming tribe that settled primarily along the mississippi and arkansas rivers;

it was the "4. potsdam" conference that demanded the unconditional surrender of japan, since it was clear that the japanese would continue to find until the very last man otherwise.

during the hitler era and it caused them to declare war on germany