请问有没有人可以 用英文 介绍一下英国国旗的历史 啊组成啊，意义啊等等情况?

400th anniversary
The union flag was first seen in 1606 and the version that we know today was drawn up by the College of Arms in 1801 to represent the Act of Union.

History
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The Union Flag before 1801
When James VI of Scotland inherited as James I of England in 1603, the crowns of the Kingdom of England and the Kingdom of Scotland were united in him, although each remained independent states.

On 12 April 1606, a new flag to represent this personal union between England and Scotland was specified in a royal decree, according to which the flag of England (a red cross with a white background, known as St George's Cross) and the flag of Scotland (a white saltire with a blue background, known as the Saltire or Saint Andrew's Cross) would be "joyned together according to the forme made by our heralds, and sent by Us to our Admerall to be published to our Subjects." The original sketches which accompanied this specificatio