i think the answer is D. my friend
Answer:
Natural resources are materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain. Such examples that are found in the United States are gold, silver, copper, nickel, iron, lead, uranium, bauxite, mercury, tungsten, and zinc.
The 1920s through the 1940s was a time of great change in the United States, as war mobilization had sparked the economy and brought it back from the Great Depression.
