The New Conquistadores have been invading us for decades. Exactly right. It's also important ot recognize that Quigley's definition of an Age of Expansion doesn't exclusively refer to territorial ambitions.
I would view the IIs as more a form of mixture than the invasions Quigley was speaking of. Could it have happened in the past as a prelude to invasion? Sure but there is no chance Mexico or Canada would successfully destroy our civilization. Or even want to.