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What is the social order of the ancient river valley civilization of mesopotamia?

Why do all market economies have taxes to support armed forces police forces public schools and at least some form of public transportation?

Quick using the information in the graph, one might speculate that a) w. w.i created increased job opportunities in the u. s. b) the election of president hoover in 1936 caused unemployment to decline. c) the return of soldiers following w. w.ii caused unemployment to increase in the u. s. d) the new deal programs of president roosevelt created employment opportunities in the u. s.