>>520553501
World Crude Oil Production, 1940 (approx. 276 Mt total)
1. United States — 182.7 Mt — ≈ 66.2 %
2. Soviet Union (USSR) — 29.7 Mt — ≈ 10.8 %
3. Venezuela — 27.4 Mt — ≈ 9.9 %
4. Iran (Persia) — 10.4 Mt — ≈ 3.8 %
5. Dutch East Indies (Indonesia) — 7.9 Mt — ≈ 2.9 %
6. Mexico — 6.7 Mt — ≈ 2.4 %
7. Romania — 5.8 Mt — ≈ 2.1 %
8. Colombia — 3.6 Mt — ≈ 1.3 %
9. Iraq — 3.4 Mt — ≈ 1.2 %
10. Others (combined) — ≈ − 2.8 % total (smaller producers below 1 Mt each, incl. Canada, Argentina, Egypt, etc.)
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Source:
League of Nations, Statistical Yearbook 1940 (as summarized via History StackExchange and secondary compilations of pre-WWII oil statistics).