15. How did the Oregon Trail get its name

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The settlers gave a sigh of relief if they reached Independence Rock—a huge granite rock that marked the halfway point of their journey—by July 4 because it meant they were on schedule. So many people added their name to the rock it became known as the “Great Register of the Desert.”

The settlers gave a sigh of relief if they reached Independence Rock—a huge granite rock that marked the halfway point of their journey—by July 4 because it meant they were on schedule. So many people added their name to the rock it became known as the “Great Register of the Desert.

answer; /// i believe that the correct answer is (d)the huang he river valley;

explanation:

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