We are talking about different things.
The climate in the US is generally far more harsh than that of Europe.
The Med has a beautiful, easy-going climate the whole year. There is no winter, there are no severe storms (or at least they are small ie no Hurricanes), and it's generally not brutally hot.
The continent, UK has fairly mild winters and no super aggressive weather.
Even the Scandinavian regions - most of their settlements are near the ocean, which makes them much milder than say, Canada. Montreal is further south than Copenhagen (actually, Montreal is the same latitude as Northern Italy!) but Montreal weathers are crushing compared to anything in Denmark.
All of these European areas will have been close enough to 'civilization' for 1K years, and usually easy access to some ocean port for transport.
The 'New World' was brutal. Winters are rugged, summers can be hot and balmy. Before they could plant crops they had to clear the trees. Aboriginals provided a whole set of other complications (I'm not saying this is fair, just from a certain perspective). Most of South America has it's own harsh charms as well.
And the distances are vast - when you're in what is now 'Montana' a little over 100 years ago - you might as well be on the moon. There's no rivers, roads, very sparse rail - no reasonable way in. Crossing the continent was life-threatening.
But from an industrial perspective, yes, you are absolutely right: much of North America is ultimately arable, there's no Habsbourg / Napoleonic Empire to throw you off, it's perfect for building an industrial agrarian society.
But there's absolutely a 'rugged/independent' nature to North Americans that doesn't quite exist in Europe.
The American Revolution was very different from the French Revolution.
North Americans have always viewed power as a kind of expression of 'independence' whereas Europeans have always viewed it as some kind of entente between the nobility and the plebes.
It's mostly historic, but there are absolutely differences that remain ... Hint: the #1 selling vehicle in the US and Canada is ... a pick-up truck! They don't even have such things in Europe, rather, these little Lorrie/van type things which individuals, for the most part, don't even drive.