And then just going about your day
is this an accurate representation of the US landmass ? I was under the impression they were much biger than that…, but they’re roughly the size of Europe ?
The whole continent of Europe is bigger than the USA. The EU (union) is smaller than the USA.
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Drag, drop and rotate countries, states, provinces, and regions around the map to compare their relative size. Is Greenland really as big as all of Africa? You may be surprised at what you find! A great tool for educators.

The True Size

It looks just slightly bigger than in the OP’s screenshot

The entirety of Oregon and most of California and Washington are ocean in this image
And none of the US covers Norway, Sweden, or Finland, or some parts of European Russia. And parts of Texas are in water. It’s… not a perfect shape match, yeah.
The two “maps” are wildly out of proportions anyway. Looks like Sweden is the size of the entire US West Coast. When in reality it’s about the size of California
Given how the US border is distorted (Maine is north of the 49th parallel) I’m guessing this is one of those maps that distorts things as you move them around to keep the area constant. Like look how big Greenland looks up in the corner.
Greenland is not in the image
Then what is the unlabeled landmass at the very top left, northeast of Iceland?

The landmass in the very top left on the image in this post. Is Iceland.

Greenland is not northeast of Iceland either. It’s northwest.

I meant this one, from earlier in this thread.

Right. Sorry, my bad.

One of the most common criticisms of the Mercator map is that it exaggerates the size of countries nearer the poles, while downplaying the size of those near the equator

For example, let’s move Russia towards the equator

Mercator does compensate for that by introducing reference rectangles. But of course, that doesn’t help when people making posts using those maps, are unaware of how to read them. And also just remove said reference rectangles

If you move it the coast of Ireland (like the original) I’d say it’s pretty much the same

Alaska and Hawaii aren’t pictured.
Because they’d be in Morocco!^[As any good US elementary school map of the US would show!]
The USA is slightly smaller than Europe (not the EU) if you include Alaska and Hawaii