At the end of World War II, the United States had half of world GDP and the dominant military power.

The claim has two parts: the US share of world GDP at the end of World War II (around 1945), and US military dominance. TRUE: mainstream economic-history estimates (for example the Maddison Project or standard historical accounts) put the US share at about half (roughly 45–55%), and the US is recognised as the dominant military power. MOSTLY TRUE: military dominance holds and credible estimates put the GDP share at about 40–45%, or a recognised range of estimates includes about half while others are lower. MIXED: military dominance holds, but estimates put the GDP share around 30–40%. MOSTLY FALSE: the GDP share is well below that (for example about a quarter), so 'half' is a substantial overstatement of a real lead. FALSE: both parts are contradicted.

Set before the research began.

1. E1 The Settlement of 1945 Princeton Scholarship Online (Oxford Academic) · 2 April 2019

   “The United States commanded a far more favorable power position than it did after 1919.”

2. E2 The Settlement of 1945 Oxford Academic (Princeton Scholarship Online) · 2 April 2019

   “The United States commanded a far more favorable power position than it did after 1919.”

3. E3 Charted: How Economic Power Shifted Over 200 Years Visual Capitalist · 4 August 2026

   “By 1944, the U.S. accounted for 29.7% of world GDP, the highest share reached by any economy in the modern period covered by this dataset.”

4. E4 Hegemon and Hegemony | Encyclopedia.com Encyclopedia.com · 28 September 2026

   “The United States produced almost half of the world's economic output in 1945. By the 1970s that figure declined to 25 percent, where it has more or less remained through the early twenty-first century.”

5. E5 Hegemon and Hegemony | Encyclopedia.com Encyclopedia.com · 28 September 2026

   “In 1945 the United States had a clear preponderance of economic and military power.”

6. E6 Great Responsibilities and New Global Power The National WWII Museum · 22 October 2020

   “By the end of World War II, however, the United States stood as one of two leading global powers, alongside the Soviet Union”

The sources disagree on the GDP part of the claim. A reference encyclopedia entry says the US produced almost half of the world's economic output in 1945 (E4). A dataset-based chart puts the US share at 29.7% of world GDP by 1944 (E3). On military power, E5 says the US had a clear preponderance of economic and military power in 1945, and E1/E2 describe a far more favorable US power position than after 1919, although E6 calls the US one of two leading powers alongside the Soviet Union. Because the range of estimates includes about half while others are lower, and military dominance is broadly supported, the criteria point to mostly true.