Is it okay to use wikipedia as a source?

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 were the economic, religious and social/political factors in the abolition of slaves

Why did the 24th amendment and the civil rights act succeed when other legislation had failed?