Why is it called rooting for someone?

Why is it called rooting for someone? When you root for someone, you’re on their side or in their corner. This phrase is an invention of American English that was originally used in the context of baseball, from a now obsolete meaning of the verb root, “work hard.”

When you root for someone, you’re on their side or in their corner. This phrase is an invention of American English that was originally used in the context of baseball, from a now obsolete meaning of the verb root, “work hard.”
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