Final answer:
Americans have held differing views on territorial expansion and imperialistic practices throughout history for several reasons, including debates on slavery, the desire for an empire, and constitutional questions about liberty and national interests.
Step-by-step explanation:
Americans have held differing views on territorial expansion and imperialistic practices throughout history. The issue has concerned Americans over time for several reasons. Firstly, territorial expansion brought about debates on whether newly acquired lands would allow slavery or be free.
Secondly, the desire to have an empire like the European powers led to the acquisition of overseas possessions. Lastly, the pursuit of empire raised constitutional questions and concerns about maintaining liberty while preserving national interests.