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There are more than three, but the more important were:
-- a great increase in population, leading to statehood
-- land seized from the Spanish landowners and the Indian tribes
-- rapid development of railroads and ports

Of course, these would have occurred anyway following US acquisition of the Southwest in the Mexican-American War. The proponents of Manifest Destiny were already working to tie the east coast and the west coast together when it was interrupted by the Civil War. There was also the beginning of Chinese Immigration which rapidly grew by 1852.

Other notable effects:

  1. Relocation of many indigenous Indian tribes.
  2. Rampant erosion from hydraulic mining.
  3. Grizzly bear exterminated (even though it is state symbol on flag).
  4. Urbanization.
  5. Property rights of spanish land grant ranchers ignored as gold seekers invaded.
  6. Increase in crime and lawlessness
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12y ago

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