Final answer:
Imperial conquests by the U.S. in the 19th century resulted in a significant cost in human lives.
Explanation:
The cost of the U.S. engaged in imperial conquests during the nineteenth century was human life.
The expansionism and imperialism pursued by the United States in the late 1800s resulted in significant human casualties in various conflicts, such as the Spanish-American War and the conquest of territories like the Philippines. This period saw the U.S. striving to establish its influence and control in different regions, often at the expense of lives lost.
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