expansionism
Americannoun
noun
Other Word Forms
Etymology
Origin of expansionism
Explanation
For the word expansionism, think of something expanding, of getting bigger. This time, it's not your waistline, it's a country. Expansionism is how the United States ended up with 50 states instead of 13 colonies. Way back when, expansionism used to be called "imperialism." But then imperialism got a bad name, so now it is called expansionism. Basically, it's a country trying to exert influence over another country, or actually moving on in or invading. Needless to say, the other country isn't always so happy about being swept up in expansionism.
Vocabulary lists containing expansionism
STAAR U.S. History 2
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Chapter 23: Rise to World Power
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Two World Wars—and the surge in destructive technology—showed that industrial warfare had made territorial expansionism devastating.
From The Wall Street Journal ● Jan. 24, 2026
VE Day was a joint Allied triumph over Nazi Germany; over hatred, dictatorship, the Third Reich's territorial expansionism and heinous crimes against humanity.
From BBC ● May 3, 2025
Later it became standard fare she studied in high school: the engineering feat connecting two oceans, a formative adventure in American expansionism, an early notch on Teddy Roosevelt’s belt.
From New York Times ● Mar. 5, 2024
His expansionism, bluster and repression have produced quantifiable results.
From Washington Post ● Oct. 20, 2022
President McKinley again had defeated William Jennings Bryan, but the campaign issue was American expansionism overseas.
From United States Presidents' Inaugural Speeches by United States. Presidents.
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
