The Germanic people have been hit hard several times in history and yet repeatedly come back to be a strong force in the region. They came back from being defeated Emperor Augustus, being ravaged by having the Huns run across their country, being kicked around following the fall of the HRE, being defeated in WWI, WW2 and being spit up and having part of their country occupied by the USSR.
They usually come back to become a strong force. After being conquered by Rome and ravaged by Huns they managed to conquer Rome. After the HRE fell they formed Germany. After WWI they managed to reform into a strong nation. Even after that nation fell they reformed after being split up by the USSR and become a major force in Europe. What about them makes them so resilient?
Let's not forget that the English and by extension the Americans were a Germanic tribe.
This is not only not right, it's not even wrong.
1. The Romans did in fact conquer Lesser Germania. There was no individual nation to "come back" from Teutoburg Forest - particularly because the Cherusci, Marsi, Chatti and a few other Germanic tribes won that one. Later on, the Romans repelled the Marcomanni in the mid-2nd century.
2. It's simplistic to say the Germanic tribes conquered Rome. There was no central Germanic government waging a war of conquest. Some of them actually got co-opted into it and worked their way into positions of power from the inside. The Romans eventually took to hiring Germanic tribes to serve in the military, and they got around. There was no organized Germanic conquest of the Western Roman Empire, and the migration of Germanic tribes into their various homelands really only took place after the Goths beat up a dehydrated and frustrated Roman army and exposed Roman weakness to all and sundry. What happened was less a conquest and more of a mass migration.
3. Actually, certain contingents of Germanic peoples joined Attila - he had allies among the Franks and Burgundians, for instance. There really wasn't much in Germania for Attila to ravage; he wanted the nice, fat, rich cities of the Empire.
4. Germany was part of the HRE; it's what used to be called East Francia. Typically the Emperor was also King of Germany and was in fact King of Germany before he was ever crowned. Even then, the HRE was hardly some huge central power; the Empire was notorious for being a collection of decentralized little fiefdoms and electorates that looks absolutely ghastly when you put it into map form.
5. The suggestion that the Anglo-Saxons are genetically a Germanic tribe is probably not true. It's highly unlikely that the Germanic arrivals displaced Celtic Britons. Instead they probably formed a ruling class who intermingled substantially with the natives and impacted the gene pool and the culture. Your average English person today is maybe 40% Germanic, tops, if I'm reading the data right (and I'm doing it on the fly because there's just so much here). That's saying nothing of the other inhabitants of the British Isles, like the Scottish and the Irish.
6. After World War I they managed to form into "a strong nation." That nation was Nazi Germany. I do not think Hitler's country is something to celebrate.
7. Native Americans are actually closer to Tungusic peoples than anything. With that bit of pedantry aside, European settlers in America also included the Irish, the Scottish and the Welsh. As well, actual Germany didn't manage to colonize much of the New World beyond Klein-Venedig and a smattering of others that didn't last.
Germany has some very fertile soil, leading to high population levels, as well as plenty of natural resources that were useful once the Industrial Revolution kicked in.
Yep.