Answer:
"oklahoma, texas, and louisiana shared in the wealth"
Explanation:
the subordinate clause is" that came from the discovery of oil". this effects the meaning of the independent clause.
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An ambiguous reference means that it's vague, and it leaves the reader unsure. this often occurs when a pronounce is set after two or more subjects that it COULD apply to, but the reader isn't sure. your answer is choice 1.