<span>the best option is B
the development of more efficient agriculture
The emergence of efficient forms of agriculture especially in Mesopotamia, led to emergence of early city states as food was produced in surplus to feed the town population. it also led to division of labor. this form of agriculture also contributed to sedentary lifestyle and improved nutrition thus explosive population that contributed to city establishments.
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´´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.
The Louisiana purchase included:
arkansas, iowa, missouri, kansas, oklahoma, nebraska, and parts of minnesota
