Which statement best explains how the louisiana purchase the u. s. economy? a. it made it easier for native americans living along the mississippi river to sell furs to people in europe. b. it enabled aristocrats from other countries to establish large estates along the mississippi river. c. it made it easier for cities along the mississippi river to trade with cities on the east coast and in other countries. d. it enabled immigrants from other countries to find jobs on steamboats on the mississippi river.