The Philadelphia Convention had continental vision and it acted accordingly.
The European powers have been able to patch together a European Union of sorts, but as yet they have effectively restricted its potential for international action and internal reform by imitating the Polish-Lithuanian Commonwealth.
Here is an excerpt of what the Wikipedia article Liberum veto tells us about the effects of the unanimity rule:
“In the first half of the 18th century, it became increasingly common for Sejm sessions to be broken up by liberum veto, as the Commonwealth's neighbours — chiefly Russia and Prussia — found this a useful tool to frustrate attempts at reforming and strengthening the Commonwealth. The latter deteriorated from a European power into a state of anarchy.”
The Wikipedia article is available at:
Is this the way we want it to be? Is this how we should want it to be?