It is false that primary sources are the only sources that historians use, since it is important to consult the works of other writers and historians to get an idea of how events in history have played out. Historians usually use a combination of secondary and primary sources.
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Saturn because Saturn has a shield
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Three way's California changed because the gold rush was, California gained population, causing a permanent change in government. Also, San Francisco became the center of banking, shipping, trade, and manufacturing. Most important, because of California's new grand population, California became a free state in 1850. The Gold Rush significantly influenced the history of California and the United States. It created a lasting impact by propelling significant industrial and agricultural development and helped shape the course of California's development by spurring its economic growth and facilitating its transition to statehood.
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