´´The M.A.I.N. causes of world war 1 were Militarism, secret Alliances, Imperialism and Nationalism .The driving force was Nationalism ... The igniting incident of the ´´Great WAR´´ was the assassination of Archduke Franz Ferdinand, heir to the Austro-Hungerian Empire, in Bosnia by a serbian nationalist.
Answer:
Probably B, don't you think?
Explanation:
The Jim Crow Laws served to segregate the colored from the whites not poor and rich. Race played the prime role here.