Don't just rely on colors. Use a photo editing tool to drop PNG team logos over their capital cities or largest conquered territories.
Which or tournament you want to map out? football imperialism map editable link
When Team A plays Team B, they are not just playing for a win in the standings. They are playing for land. Don't just rely on colors
To help me tailor the perfect map setup for your league, tell me: football imperialism map editable link