Help me with this history thingy

What was the u.s. government's office of indian affairs responsible for doing?

What triggered the surge of conservative governments in central europe at the end of world war i? a. the disintegration of european families in the wake of urbanization. b. a worldwide revolutionary upsurge. c. the revival of the austrian-hungarian and ottoman empires. d. the british suppression of the indian nationalist movement. e. the killing of the tsar during the russian revolution?

What was the most important consequence of the large-scale ecological changes in africa two hundred thousand years ago?