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pacific ocean:early exploation route

atlantic ocean:highway? explorers,settlers,immargrants

missippi river:transportation arteries farm and industrial products links to ports and the world

missouri river:transportation arteries farm and industrial products links to ports and the world

ohio river:gateway to the west man made river

columbia river:lewos and clark

colorado river:explored by the spanish

rio grande:mexico border

gulf of mexico:french and spanish exploration routes to mexico and other areas in america

great lakes:inland port cities H-uron O-ontario M-ichigan E-erie S-uperior