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|   |  Event: Mississippi River Opened to Americans Category: Planning and Development, Transportation and Infrastructure Brief Description: In 1788, the Spanish opened the Mississippi River to American traders and merchants. For the first time, Americans were allowed to ship produce down the Mississippi to New Orleans upon payment of a 15% tarriff. Year: 1788 Decade: 1780 - 1789 Beginning Date: 1788 Ending Date: 1788 |  | |
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