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Because they're southern. The confederate flag does not mean slavery, it's just the south's flag.
The flag for the South Australia flag has the southern cross in the top left hand corner and an eagle in a yellow circle down the bottom. This is it.
The Australian flag features the constellation known as the Southern Cross.
There is no Southern Colony flag.
The Southern Cross on the flag represents NZ's location in the South Pacific Ocean(blue background) :)
The three horizontal stripes on the South Vietnamese flag represent the three regions of Vietnam: Bac(Northern), Trung(Central), and Nam(Southern).
The flag of Southern Sudan was adopted following the signing of the Comprehensive Peace Agreement that ended the second Sudanese civil war. The flag was previously used as the flag of the Sudan People's Liberation Movement. The flag is similar to the Flag of Kenya with the addition of a blue triangle and gold star at the hoist. The colours are said to represent the Southern Sudanese people (black), peace (white), the blood shed for freedom (red), the land (green) and the waters of the Nile (blue); the gold star, the Star of Bethlehem, represents unity of the states of Southern Sudan (See related Link for more)
The Confederate flag, often associated with the American South, has a divisive history. Some view it as a symbol of Southern heritage while others see it as a symbol of racism and oppression due to its connection with the Confederacy and history of slavery. It is important to consider the perspectives of those who may be offended by its display.
The people of southern Sudan have overwhelmingly decided their destiny in the January, 2011 referendum. A flag is a symbol to unite them. South Sudan will formally become independent on 9 July 2011See related link
Flag of the Southern Cross was created in 1887.
South Africa
In some countries like Kenya the black in their flag means the people or them.