The EU has already a currency (Euro) and also an anthem (Ode an die Freude)
A lot European politicians already said that a united Europe is the only future of Europe.
Politicans for a USE
Politicans against USE
The Justice commissioner Viviane Reding already said that a united Europe will be most likely found in 2020.
The EU's justice commissioner, Viviane Reding, said in comments published Monday that she views a "United States of Europe" as the "right vision" for overcoming the current crisis over the medium term, according to German daily Rheinische Post.
She said that means that the European Commission has to become a European government, particularly in economic policy, according to the newspaper. The European Parliament would watch over the commission, she added.