Coalition Colors - Simple But Nice Idea For Age Of History 3

[OwnM3Z0 1,101]

The Idea Is, when two or more states are allied against one or more state and vice versa in a large scale conflict (ie atleast one of the civs is a great power) the offensive side will change their color to red and the defensive to blue on the map until the war ends, allowing a much easier way to see coalitions

[Thefernofrommars 86]

I think possibly just making it an outline, instead of changing the overall color would work better. Here's a shit rendition I made in MS paint, probably with thicker  borders too.