Why did the traders establish trading posts along rivers and other waterways?

Why did the traders establish trading posts along rivers and other waterways?

Because the people of that time probably traveled by boat, so that would be an easy place to meet to trade.

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populist movement, in u.s. history, politically oriented coalition of agrarian reformers in the middle west and south that advocated a wide range of economic and political legislation in the late 19th century. thus in 1892 their leaders organized the populist, or people's, party, and the farmers' alliances melted away.