Consider this . . .

Here, in the 21st century, with its wealth of technology so marvelous they would be considered just a mere 100 years ago; of knowledge so freely available it staggers the imagination; social assistance systems of incredible altruism

Yet, with all our technology, all our knowledge, all our help, Negroes still continue globally fail advance beyond their neolithic barbarism. Even when advances are bestowed upon them, they will quickly revert to a more primitive existence unless force is applied, and then only so long as force exists.
Why such endeavors be successful in a past bereft of such social entitlement programs, civil rights favoritism, and the restriction of knowledge to nobility (and other privileged classes).

How could Egypt and India prevent this when we, with all our technology and knowledge could not?

No, they were swamped and dragged them down into violent barbarism the same as we see globally now.
We have the same urban areas of negro dominated slums, ghettos, ruins filled with some of the most violent, blood thirsty, savage, feral creatures to ever stride the planet. Our nations are walking down the same path of negro dominated barbarism as Egypt and India.

Let us hope our descendants will remember these words:

Beware the negro, for he is the Devil's pawn. He kills for sport or lust or greed. Yea, he will murder his brother to possess his brother's land. Let him not breed in great numbers, for he will make a ruin of his home and yours. Shun him; drive him back into his jungle lair, for he is the harbinger of death.