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| 1930, Jan. 21–April 22 |
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| London naval conference, resulting in a three-power treaty signed by the United States, Great Britain, and Japan (See 1930, Jan. 21–April 22). | 1 |
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| March |
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| CLARK MEMORANDUM ON THE MONROE DOCTRINE made public by the State Department. Written by J. Reuben Clark, undersecretary of state two years before, the memorandum declared: 1. The Monroe Doctrine is unilateral. 2. “The Doctrine does not concern itself with purely inter-American relations.” 3. “The Doctrine states a case of the United States versus Europe, not of the United States versus Latin America.” 4. The United States has always used the doctrine to protect Latin American nations from the aggression of European powers. 5. The Roosevelt corollary is not properly a part of the doctrine itself, nor does it grow out of the doctrine. | 2 |
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| June 17 |
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| Smoot-Hawley Tariff Act signed by Hoover in spite of protests of more than 1,000 trained economists. Duties higher than ever. This led to widespread reprisals and retaliation by other countries. By the end of 1931 some 25 countries had taken steps to retaliate. | 3 |
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