Final answer:
Natural resources, Monroe Doctrine, manifest destiny are important concepts in Social Studies.
Step-by-step explanation:
Natural resources is the term that relates to valuable materials like minerals, oil, and agricultural products that are sought after for economic gain. These resources are considered essential for the development and growth of economies.
The Monroe Doctrine, named after U.S. President James Monroe, warned against European colonization in the Western Hemisphere. It expressed the intent of the United States to remain neutral in European wars, but also established that further colonization or meddling in the affairs of nations in the Western Hemisphere would be viewed as a threat to the U.S.
Manifest destiny is the concept that involves the belief that the United States was destined to expand across North America. It was often used as a justification for territorial expansion and westward settlement.
The Frontier Thesis, formulated by Frederick Jackson Turner, argued that the American frontier played a crucial role in shaping the American character, democracy, and the development of unique American institutions.
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