No, rivers did not used to be bigger than they are now. Rivers themselves go through a constant state of change; if one were to take a video camera from space and look down at the Mississippi River over a 10,000 year time frame and fast forward it, than the river itself would look like a snake, moving constantly back and forth. In places where there is drought, the streams and smaller rivers that feed into larger ones usually dry up, but then are recharged when it rains again and floods.
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