Answer:
Social scientists who study prehistoric history face a unique challenge because there is very little evidence from prehistoric times
Explanation:
There are huge gaps of time for which there is no evidence at all.
<span><span>A.</span><span>Technology was reducing the demand for skilled laborers.</span></span>
The United States believed that the economic aid provided by the Marshal Plan would help contain the spread of communism
<span> because billions of dollars and millions of lives were lost in the fight.</span>
