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Breeds of chicken. White Leghorns, Rhode Island reds, Araucanas. They all lay eggs of different colors. It’s just that white Leghorns are the usual choice of battery hen in the US and lay white eggs. A cultural assumption about brown eggs being better has resulted in brown egg laying breeds being preferred for “organic” or “free-range” eggs. They’re all the same.
Different varieties of birds lay different coloured eggs. Our most popular breed in the UK is one that lays brown and the most popular breed in the US is one that lays white.
This quora question explains it in more detail if you are interested:
https://www.quora.com/Why-do-American-eggs-have-white-shells-and-British-ones-have-brownish-shells
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