Total war is the idea that the enemy can best be defeated by attacking everything: soldiers, citizens, food, supplies, and more. ... The warfare conducted by ancient civilizations, such as Persia or Rome, and the modern warfare conducted by the Nazis during World War II are both good examples of total warfare.
By issuing the Declaration of Independence, adopted by the Continental Congress on July 4, 1776, the 13 American colonies severed their political connections to Great Britain. The Declaration summarized the colonists' motivations for seeking independence.
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The war occurred because Mexico severed connenctions with the US after they (US) aquired Texas. On May 13th, Congress overwhelmingly approved a declaration of war. They entered the war divided. Democrats favored the conflict. Many viewed it as conscienceless land grabbing.
The answer would be, "C".