#### Solution By Steps***Step 1: Identify the key factors that contributed to the United States becoming a world economic power in the 20th century.***The key factors include industrialization, technological advancements, a large domestic market, innovation, and global trade.***Step 2: Evaluate the options based on these key factors.***A. The United States put effective trade barriers in place to limit trade with other nations.- This statement contradicts the idea of the U.S. becoming a world economic power through global trade.B. The United States became one of the world's leading importers and exporters of goods.- This aligns with the importance of global trade in the U.S.'s economic growth.C. The United States stayed out of major world wars and instead made economic investments.- While avoiding wars can be beneficial, economic investments alone do not fully explain the U.S.'s economic rise.D. The United States prevented other countries from abandoning the gold standard.- The gold standard was significant historically but not the primary reason for the U.S.'s economic power.#### Final AnswerB. The United States became one of the world's leading importers and exporters of goods.#### Key ConceptGlobal Trade#### Key Concept ExplanationGlobal trade, through becoming a major importer and exporter, was a crucial factor in the United States' rise as a world economic power in the 20th century. This allowed the U.S. to leverage its industrial and technological capabilities on a global scale, driving economic growth and influence.
Follow-up Knowledge or Question
What are the key factors that contributed to the United States becoming a world economic power in the 20th century?
How did the role of innovation and technology impact the economic growth of the United States in the 20th century?
What are the implications of being a leading importer and exporter of goods on a country's economy and global influence?
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