Albert Einstein became an American citizen in 1940 while keeping his Swiss citizenship.
Famous People - Facts for Kids

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Random Facts About Famous People For Kids
Albert Einstein’s work helped explain why the sky is blue (it’s because of how light scatters in the atmosphere).
Barack Obama exercised for 45 minutes six days a week while he was president.
Kamala Harris was born on October 20, 1964, in Oakland, California, making her the first Vice President to be born in that state.
Yayoi Kusama was born on March 22, 1929, in Matsumoto City, Japan, where she grew up surrounded by beautiful mountains and nature.