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The Union Jack Flag is the national flag of the United Kingdom. It represents emblems of three countries under a single Sovereign. The three countries are England and Wales, Ireland, and Scotland. The Union Jack Flag presents a combination of three different national symbols. St. Andrews cross represents the Scotland flag, St. Patrick's cross represents the Ireland flag, and St. George's cross represents the England flag. St. Patrick, St. George, and St. Andrew are the patron saints of their respective countries.
The cross of St George is a red cross on a white ground. The cross of St Andrew is a diagonal white cross on a blue ground. The cross of St Patrick is a diagonal red cross on a white ground. After the Act of Union of Ireland with England, Wales, and Scotland on 1 January 1801, the cross of St Patrick combined with that of the previous Union Flag.