Did you do any research? No, you didn't.
There are two different things.
1) How much each country pays for NATO directly
2) How much each country sends on defense.
The former, the US doesn't spend much. Germany pays twice as much, and is 4 times smaller. This figure nobody really cares about.
The latter is just a figure of how much a country's defense budget is.
But this figure barely tells the story.
Last week, Nato members agreed to spend 3.5% of GDP on core military capabilities by 2035 with an added 1.5% allocated to strategic resilience, including
www.newcivilengineer.com
For example: "Italy to reclassify 3.6km £11bn Sicily bridge as defence spending to meet Nato objectives"
So, you can put anything through as "defense spending".
For example, former soldiers with health problems in the UK got through the NHS, it's health spending. The US spent $10 billion on Medicare-eligible retiree health fund contribution (MERHFC) as defense spending.
RDT&E is $100 billion. The US makes a lot of money by selling military equipment, this does not reduce the defense budget. That was $118 billion, so the US made $18 billion but passed of the expenditure as military spending.
Then you have the cost of military spending outside of NATO. For example troops in Japan and South Korea have nothing to do with NATO. Those countries aren't in NATO.
Space is $22 billion, classified (which could be anything from massages for the President to free dog poop for squirrels in military uniform, to CIA etc) is $44 billion.
Take out all the stuff that isn't really NATO and what does the US have left?
Most EU countries do not go around the world warring, or putting troops in places. Their forces are there ONLY to protect their country or used for NATO. The US is totally different.