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IOTL we have pan-African, pan-Arab and pan-Slavic colours and even the Central American combination of (light) blue and white.
I thought about which other pan-colours are possible. One of the best candidats in my opinion are the Romance speaking countries. We have already kind of a theme in OTL: vertical tricolors (opposed to "Germanic" horizontal tricolors). We even have two common colours in the flags of France and Italy: White and Red.

I think with a Napoleonic POD we could see some other flags with the same common features.

Red-White-Red for Spain
Black-White-Red for a generic Romance country (maybe Belgium, Romania, Sicily or Portugal).

I think if Spain would have gotten such a flag it would have been enough to get some common flag-theme going.

What do you guys think, plausible or not? And what other pan-colours could have been? Pan-Nordic/Germanic/Asian/Muslim/Turkic?
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