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The flag of Hawaii (Hawaiian: Ka Hae Hawaiʻi) has previously been used by the kingdom, protectorate, republic, and territory of Hawaii. It is the only US state flag to include a foreign country's national flag. The inclusion of the Union Jack of the United Kingdom is a mark of the British Empire's historical relations with the Hawaiian Kingdom, particularly with King Kamehameha I. The flag continued to be used after the 1893 overthrow of the Hawaiian Kingdom.

Source: Wikipedia