At the end of the Little Ice Age the climate changed. The warmer weather made fruit and roots much easier to find, but till the invention of agriculture most people were both hunters AND gatherers.
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Because it meant they would have a surplus of what they farmed
agriculture
how did native amreican lived one place
Sutter's fort is still standing and it never did "fall." No battles took place at the fort. It was built for people who came to CA to settle. Today, it is a state park and you can tour the fort.
Proximity to the marketplace.