Answer:
The War on Terror, also known as the Global War on Terrorism and U.S. War on Terror, is an ongoing international military campaign launched by the United States government following the September 11 attack. The war costed 2.4 trillion dollars by 2017, and thus was not worth it in my opinion.
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Impending war between Mexico and the US.
The American settlers in California resented the Mexican government and were fearful of oppressive reforms with rumors of a war between Mexico and the US. To secure their place, troops incited a rebellion and California declared their independence.