The real genius of the US Constitution is that it established individual freedoms that allowed people from warring countries to live together in peace.
The Founders knew government tyranny and was a major source of creating national rivalries. They tried to limit government and tried to prevent the US government from entering long term alliances. They created a high threshold of national consensus before waging war.
Slowly, we are sliding back into the bad policies that have wracked Europe for millenniums.
Europe is still paying in blood for the collapse of the Roman Empire.