The population movements are larger and faster, though. The various Germanic tribes did flood over the borders en masse largely in a single year but it's likely the numbers in the hundreds of thousands over all, rather than the millions.
Today we have no leaders of Stilicho's calibre. Merkel is more in the vein of Honorious, able to turn any advantage into a handicap.
Aside from that, no historical lesson is exact but the WRE faced many of the problems we do today, wasteful and corrupt to-heavy state organisations, depleted and demoralised armed forces, monetary collapse, falling native populations and even adverse climate change.
As I have said before, the mistake our ancestors made was believing Rome could not fall. That's eerily similar to the EU mantra of "ever closer union", the assumption that history is on your side.
I heard the good looking women were Persian
You have just had a massive scandal where hundreds of women were sexually assaulted in public and the Police were powerless to stop it.
Syria can easily send you another million and so can North Africa, time to wake up and smell the coffee. This doesn't have to go on for a hundred years, in another three years you could have 4.5 million new immigrants who don't speak your language or share you ideals.
Lets suppose for a moment that, like Sweden, roughly 70% of them are men, who will mostly be men of fighting age. The entire Bundeswehr, including reserves, is only a around 210,000. If these people decide to riot en masse you'd potentially have to mobilise your entire armed forces alongside the police to stand up to them, assuming no more enter Germany, which they will.
Germany needs to recognise the scale of the problem now or reap the whirlwind.
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