Most likely will not happened again.
About 2 million immigrants, and at lease a million illegal
immigrants come into the country every year to compete
for jobs against the native born Americans. This is
deliberate government policy, and will not change even
if there is a change of political party, nor philosophy.
The ruling elite that controls all facets of the government,
and media wants a situation that will bring about a
communist socialist government that sole purpose
is to fight perpetual wars just to make the wealthy,
more wealthy, and a small middle class, a privilege group
whom so purpose is to protect the status quo. The
vast majority will be the underclass, and the very poor
whom will have to fight among themselves to get
enough food to eat, and survive the mean streets that
were created on purpose by the ruling elite.
If you want to see the near future, just look at the
streets of Bombay,India.