You probably can't prevent imperialist wars, but you can make life a bit harder on the imperialists than is usually the case. By, for instance, explicitly mandating that European military forces be physically incapable of conducting serious offencive operations outside European and allied territory. And then giving taxpayer standing to sue over violations of that article.

Similarly, while no piece of paper can guarantee that checks and balances are actually enforced in the real world, it can put the institutions into place and attempt to make them as robust as possible.

- Jake

Friends come and go. Enemies accumulate.