What is the theory behind dividing human society into Countries and States? Do the taxes collected from people on a state are meant to be spend for the welfare of the State alone or we sometimes spend the money to help other 'poorly doing' states? In a more general perspective, are we trying to 'help the less capable by distributing the earnings of the more capables' or do we not care? Are state leaders in theory Meant to seek for the welfare of their state alone even if it means bad-fare of another state? If we care for another state, do we care for another country? Or are we caring already? Type of vague, but you can understand what I am trying to ask.