Why can't I suggest war against Japan or a specific civilization?

Why can't I suggest war against Japan or a specific civilization? - Black activist wearing Anonymous mask as sign of protest

I'm playing a (built-in) custom map and Japan is attacking everyone, even the kittens! They've attacked one country I'm on excellent terms with but the game lets me suggest going to war with ONLY everyone except Oda from Japan. What the heck is going on?

civilization-5

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Why can't I suggest war against Japan or a specific civilization? - Beautiful young woman standing near old building and looking at camera

Why can't I suggest war against Japan or a specific civilization? - Thoughtful casual lady in gray t shirt with beautiful hairstyle posing and looking away while standing near old building between trimmed bushes of garden

Why can't I suggest war against Japan or a specific civilization? - From below of confident black activist in stylish outfit and famous Anonymous mask leaning on building placed in city district in daytime

Liz Phair - Why Can't I? (Official Video)

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Images: Anete Lusina, Andrea Piacquadio, Andrea Piacquadio, Anete Lusina