(Disclaimer: I do not own this series. I do not own the wizarding world. What I own is a computer, an over reactive imagination and maybe a few OCs you might see crop up. These are drabbles and are meant to be short and are only here for your amusement. Mine too, but you know. And yes, I will take requests.
Muggleborn Headcanon: Voldemort rose to power in 1997. He destroyed all records of muggle borns. Therefore, all the muggle borns that would have been younger than 11 at the time of his takeover would never have gotten their letters because he's an evil wizard and destroyed our records. The Ministry is still in the process of finding all the muggle borns. )
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After the second war the wizarding world ran into yet another problem. Besides the fact that Hogwarts School of Witchcraft and Wizardry was now in complete shambles, but that wasn't really a problem. It was a magic school and while it did need a bit of help it was mostly capable of rebuilding itself. (And People said the wizard responsible was a paranoid old coot for adding that feature! Who would ever attack a school indeed! He'd shown them all!) So really it wasn't too big of a problem to remedy. The real issue was the sudden lack of students.
It took the magical education committee an embarrassingly long time (A week before July) to realise that all records of potential muggle born students had been completely destroyed by you-know-who and his followers. It caused quite an uproar in the wizarding community and the whole committee was voted to be sacked for their negligence. However, a particularly bright witch insisted they keep them all around but reassign them to a new job. From there a new department of education devoted entirely to tracking down and finding the young witches and wizards whose names had been lost was founded.
It took a long time but eventually the newly appointed board of magical education and ministry of magic managed to regain some foot hold on what was called the 'Magical Education Disaster of 98' It'd been several years since the second wizarding war and though a good chunk of students had been relocated and properly introduced to wizarding world it just wasn't a problem that would ever go away.
To make matters worse the muggle population seemed to have exploded and with it came more and more muggle born children. As the muggle population expanded they came up with more and more ways to get by without magic and then became mostly obsessed with entertainment. The wizarding world was slammed with yet another problem, entirely different from all those in the past but yet still concerned the muggleborn population.
Muggle Pop Culture.