Austria. It is one of the oldest flags in the world, reputedly having derived from a warrior's bloodstained white tunic which was still white under his belt.
England's flag is a red cross with a white border. Georgia (the former Soviet republic) has a red cross on a white background marked by four smaller croses in each quadrant.
the American flag
A country whose flag has the colours green, white and red
Do you mean red white and green? If so it's the Spanish flag, but a red white and red flag is the Austria flag.
A simple flag with two equal red and white horizontal bars is a description of the flag of India.
A simple flag with two equal red and white horizontal bars is a description of Indonesia.
From top to bottom, the Russian flag has horizontal stripes of white, blue and red.
Civil and State flag, Red/White/Red horizontal stripes
Red, white, red horizontal bars.
That's the Italian flag (not to be confused with the Irish flag, which has horizontal green, white, and orange stripes). On the Italian flag, the order of the strips (left to right) is green, white, red.
Italy's flag is a tricolor (green, white and red) Vertical flag
The flag of Monaco is red and white in color. The flag has two horizontal stripes with a red stripe on top and the white one on the bottom.
White blue and red horizontal stripes
Dutch Flag is a horizontal tri-colour of red, white and blue.