Newton's second law is that every object will move in a straight line and in one direction unless acted on by an outside force.
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Vicksburg effects: The Battle of Vicksburg effected the Civil War because the Union got full control of the Mississippi river therefore taking over and shutting down the confederates trade, transportation, and military/fortifications.
By helping the Panamanian's overthrow the Columbian government.
In recent years the U.S. has signed two treaties turning over the Panama Canal to the republic of Panama in the year 2000. Making the Panama Canal bigger is still needed.
Why they wanted it built: The U.S. wanted to avoid going around South America and insure less time for U.S. Naval ships to travel and protect U.S. possessions around the world