The goal of sharing wealth to encourage social betterment is a laudable and positive goal. The idea of closer political union to avoid another war is also a good one.

However they are not necessarily going to go hand in hand - but I cannot think of a case where they did not. Mostly cos political conquest in empires lead to wealth "sharing" - the common idea was transaction costs dropped under one empire increasing the wealth beyond taxation costs.

This is something Eurozone has done well without actual war - but it seems to have reached the point where we are either all in for the Euro (total fair wealth sharing) or just give up.

However selling "total state level socialism" (from States that have to states that do not) is a hard sell - even if right here and now, that's how Greece looks the best solution.

However every country thinks it needs to keep it's own wealth and not give up it's sovereignty - but this is like tribes who used to live in the countries themselves - they have up Independance for security and prosperity.

It's a hard sell.