Final answer:
Doubling the size of the United States would shape Americans' perspectives on their nation's future, offering increased power and influence while also presenting challenges of integration and complexity.
Step-by-step explanation:
Doubling the size of the United States would have had a significant impact on Americans' perspectives on their nation's future. It would have expanded the country's territory and resources, potentially leading to a sense of increased power and influence. Americans may have also had to grapple with new cultural, political, and economic complexities arising from the integration of diverse regions and populations into a larger nation.
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