What is the most populous US state?
California is the most populous US state, with about 39 million people.
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- Why is Colorado called the Centennial State?
“Colorado is called the Centennial State because it joined the US in 1876.”
Reference: Colorado Encyclopedia
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Fun fact about relative height
The highest point in Pennsylvania is lower than the lowest point in Colorado.
How did the Louisiana Purchase change the size of the US?
In 1803 the US bought the Louisiana Territory from France for about $15 million. The deal roughly doubled the size of the country.