In my game, I have unified Gallia. However, I'm getting curbstombed by my neighbour Rome, which has about triple the army and manpower I have. I can't get an alliance with Carthage and I can't win any wars against Rome.
What can I do to tip the balance? I'm thinking about barbarian hunting to increase my population, but after a decade or two I saw that Rome's population is growing faster than mine, even with my complete focus on barbarian hunting.
Perhaps it's just that Rome, as the focus of the game, is overpowered, but surely there is something I can do?