May 26 – The Asian Exclusion Act is enacted, banning all Asian immigration to the United States. It was a slap in the face to Japan after their participation as a principal ally in WWI, and is seen as the spark that spurred Japan's alliance with Germany and down the path to World War II.
June 23 – American airman Russell L. Maughan flies from New York to San Francisco in 21 hours and 48 minutes on a dawn-to-dusk flight in a Curtiss pursuit.
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