It wouldn't even take active measures to destroy most infrastructure.
There are large numbers of competent White men who spend their working lives maintaining and fixing stuff so that it just seems like everything keeps working. If you stop that, even for a short period, things will fall apart. Not instantly, but you'll notice it in 6 months to a couple of years. The rate of dilapidation will also increase over time, so it will start with a few things breaking, but will accelerate.
Having too many niggers will also cause things to collapse, as niggers fuck things up through stupidity and niggery (see basically all of Africa).
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