How were slaves obtained in africa?

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?

How did political revolutions in the atlantic ocean basin affect or alter the institution of slavery and the lives of slaves

Wha industry did the refrigerated rail car impact the most