It has long been believed that the bears first evolved either in Europe or Asia, migrating to Alaska during the Pleistocene (Kurten 1968). After the retreat of the ice sheets, the bears were able to expand their range south into what are currently Canada, the contiguous United States, and northern Mexico.
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Aug 24, 2022 · Yes. Grizzlies that migrated north into the Arctic. Some developed white fur and they became the first polar bears.