Louisville and Portland Canal
...that the Louisville and Portland Canal, opened in 1830, was the first major improvement completed on a major river of the United States?
...that the <b id="mwEEs"><a href="./Louisville_and_Portland_Canal" id="mwEEw" rel="mw:WikiLink" title="Louisville and Portland Canal">Louisville and Portland Canal</a></b>, opened in 1830, was the first major improvement completed on a major <a href="./List_of_rivers_of_the_United_States" id="mwEE0" rel="mw:WikiLink" title="List of rivers of the United States">river of the United States</a>?