- If you get sick, costs should be covered by universal health insurance.
- If you lose your job, there should be a safety net.
- When you retire, there should be a decent pension.
- Everybody should have access to good education.
- We don't want war.
- We don't want to be powerless against megacorps.
In other words, there is much more that is binding us than what is dividing us (in my country, pretty much every party from extreme left to populist right agrees on these things). For those things that we don't agree on, we should find compromises.
Most in the US will, too. The nuances are where is falls apart, both in the US and in Europe.
- Should all costs be covered, for everything, no matter the cost? How would that work / How do we disband the laws of nature?
- How long should that net carry you? Does it only break the fall, or does it replace your job for eternity? Who pays for it? Do you have any obligations when losing your job?
- How high should that pension be? Who should pay for it? Should it (in part or in full) depend on you ever having worked? Can you choose when to retire?
- What is "good education", and what is "access"? I'm not all that bright, do I have a right to be taught at university? For how long? Who pays for it? Is anything expected in return?
- Are we pacifists who refuse to acknowledge that war might find us, even if we're not looking for it? Or are we preparing for war because we don't want it and believe that an aggressive imperial force will pounce unless it believe us to be capable of defending ourselves?
I don't believe that everyone in your country, much less in Europe, agrees. Once you remove the vague language and put concrete things in, you'll see people disagreeing on each point.
If it was that simple, we'll have peace on earth because everyone will be able to agree on those core things - as long as you promise them that it's their interpretation that counts.