This is a nonsense question. The EU is only a quasi-government, in that it looks a whole lot like the pre-Constitution United States (that is, a lot like the United States under the Articles of Confederation).
The EU is a confederation of independent nation-states, loosely bound together by some common economic and social policies that they've all agreed to adhere to. Warmaking requires a strong central foreign policy decision maker, one who can enforce cooperation amongst their constituents. This does not exist inside the EU. The EU has no more the ability to declare and fight a war (as an entity) than the Federation of American States, the East Asian Economic Union, or even NATO (which, cannot fight a war as "NATO", only as its constituent nations).
In any case, assuming you meant "If all military forces of all EU countries were combined to fight the US, who would win?" the answer would be: the US. It still has a larger armed forces than all of the EU, and out-spends them by a considerable margin.
Remember: the US Defense Budget (not including the "Emergency" appropriations for the US Wars in Iraq and Afghanistan) still exceeds the total military spending of the ENTIRErest of the planet.
us would win
The US has the world's most powerful military. USA wins.
China would win. China has more soldiers, bigger armies, better technology, and strong/growing allies.
there would be less deaths. they also thought that the allies could win the war without them.
Likely, yes.There's a caveat here, however.One who has superior military power can win the war if that is indeed the objective of that force.Some evidence suggests that both the US policy as well as our unstated policy is not actually to "win the war" in a traditional sense, but to create a new power dynamic that institutes long term security for the region (and vicariously, the US and her allies).
us would win
well the US is just one country but is extremely strong but still the EU has countries like France, Uk, German and Spain so the US would be obliterated but still it would do a lot of damage if nuclear weapons get involved. Such a war could porbably result in ww3.
Neither.
Florida wanted the south to win the US Civil War.
America would win no doubt because they have a better military then malsyia and us have better tech
Yes. Otherwise there would be no US.
China
The U.S obvoius
France is the most powerful country in Europe. They have the most aircraft carriers after the US and have a powerful nuclear force. However they would still be no match for the US. The us is the strongest country in the world. The us would win and the war woulndt even last a day or two
The US has the world's most powerful military. USA wins.
The United States would win. If it was solely fought between the US and Pakistan, the US would still most likely win, since the US has the best army in the world. However, if allies were pulled in, then the US would have a landslide victory.
It would be a very different world today.