Final answer:
Plentiful fresh water, good harbors, and mining operations contributed to California becoming the most populous state.
Step-by-step explanation:
The factors that helped California become the most populous state include plentiful fresh water, good harbors, and mining operations. Plentiful fresh water was crucial for agriculture, allowing farmers to grow crops and support a large population. Good harbors facilitated trade and transportation, contributing to economic growth. Mining operations, especially during the Gold Rush, attracted people from all over the world in search of wealth and opportunities.
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