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This is plainly not true. EU has a lot of its own walls. It's just the fact that it lacks long land border with countries from which major migration flows originate is what makes it a lesser topic for debates.
Why do you think migrants coming from the Middle East prefer to cross Aegean sea, instead of going by land? Because land border is all fences, barbed wire, and even landmines with not a single gap.
And limiting migration is very hot political issue in many EU countries currently.
Really? Are you talking about the landmines in Croatia that weren't fully cleared after the 1990s Balkan war? People were actually providing maps with the approximate locations of the fields so they can be safely bypassed.
You make it sound like Europe is planting mines to keep migrants out. If the reaction of a small minority of European countries (2-3) seems exaggerated when faced with over 1 million (!) immigrants, then the fact that over 7000 people [0] were killed at the US-Mexico border just over the past 20 years should really shock you to the core.
[0] https://en.wikipedia.org/wiki/Migrant_deaths_along_the_Mexic...
It felt like a "whatabout" reaction and no effort was made to remove the impression that mines are actually employed with the purpose of keeping migrants out.
Btw, I'm quite certain number of migrants drowned in Meditteranean over past 20 years is much more then 7000.
As a Canadian who's lived in Europe for the last 4 years, this is farcically false.
When my family emigrated to Canada, we were Canadian from day 1. And as you also noted in your dashed qualifiers, all those people are still considered AMERICAN. That is the North American way.
On the other hand, in Europe, i meet people who have been in their current country for 3 generations but still consider themselves as from the country of their ancestors.