Generally, the increase in travelling by America's rivers happened after the year 1784.
What is the purpose of the America's rivers?
The America's rivers are basically used for transporting people and goods from one way to another.
For instance, the Louisiana Purchase in 1800 allows the use of Mississippi waters for transportation purpose.
Hence, the increase in travelling by America's rivers happened after the year 1784.
Therefore, the Option A is correct.
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