This is just a idea ive had. with bases they dont do very much. they do give some buffs but i think they need a reason. my idea is machines and research in bases. in exchange for resource points you can research cheaper ways to sail. this would reduce costs of sailing ships. this makes larger ships more viable and more used. this could also open up whatever guns or naval weapons you may add in future. the more research the better you can upgrade. with this of course we dont want new people to be obliterated in battle but something to give advatages of being in a country. you could also research animal breeders, better armor to protect from bullets and some form of automatic anti air defence but with this it may lead to many "accidental kamis" so possibly not. this could be expanded to be nerfed or buffed but this is only a suggestion.