When my great aunt Sarah Sadie Mahler (1889-1974) got married in the Big Apple on April 16, 1912, she lost her US citizenship because her immigrant husband Samuel Smith (1889-1979) was not yet a naturalized US citizen.
Samuel (original name: Simon Solomowitz) was born in the city of Botosani, Romania, and came to New York City with his parents and siblings when he was a little boy.
After they married in Manhattan, Sam and Sarah moved to Fort Edward, NY so he could work in the paper mills. By 1920, the Smith family was back in New York City, where Sam began working as a chauffeur. As shown in the 1925 New York Census excerpt at top, Sam became a US citizen in 1924 in New York City.
Sarah's citizenship status, however, was not affected by Sam's naturalization, because of the Cable Act of 1922, which separated the citizenship status of spouses. She was a "marital expatriate" - and decided, during World War II, to take steps to regain her US citizenship.
As shown here, Sarah filed Form NH-415, applying to take the oath of allegiance to the United States. She was once again a citizen after taking the oath on February 11, 1944. Sarah was outlived by all five of her children and her husband. Today I'm thinking of her on the anniversary of her marriage in April of 1912 (not 1911, as mistakenly shown on the oath document above).