I was playing Rhyse & Fall in Beyond the Sword as the Aztec Empire. I was at war with the Portuguesse and took over Portugal in Europe while I was still trying to take over its cities in Brazil. 1 turn after I took over the capital Portugal collapsed, and its cities became Independent Nations. But apparently my civilization is officially at peace with the Independent Nations, and I don't know how to declare war on them. I even tried going to the world builder to change the diplomacy from peace to war, but that didn't work. I tried that, saw that it didn't work and I still couldn't enter their territory and then went back and it still said "PEACE". What do I have to do to go to be able to enter this territory and take these cities?