yellow peril

noun2

1. •
   (offensive, historical) The alleged threat to Western nations by East Asians, especially Chinese or Japanese people, due to their vast population, non-Western cultures, or supposed antagonism to the West.

   • I cannot, after a survey necessarily crammed with conjecture, conceive that the Yellow Peril will devastate Europe, or endanger the East Indies, though it may change their populations. — 1900
2. •
   (offensive, historical) East Asian nations or peoples, conceived as threatening.

   • It was such a journey as I had taken once before, early in our pursuit of the genius of the Yellow Peril; but this was infinitely more terrible; for now we were utterly in Fu-Manchu’s power. — 1913