In 1973 Jean Raspail published an apocalyptic novel entitled The Camp of the Saints. It was a story depicting the destruction of Western civilization, which began innocently enough with the Belgian government announcing in Calcutta, India, a policy of adopting Indian babies and raising them in Belgium.
This well-intentioned policy led a "wise man" to rally the Hindu masses of India to undertake a mass migration to Europe. They arrived first in France by the hundreds of thousands with no regard for lawful entry requirements. They showed no desire to assimilate into French or any Western culture. Europe and ultimately all of Western civilization capitulated to the Hindu masses.
Replace the Belgian government with Angela Merkel. Replace the Hindu masses of India with the Muslim masses of Pakistan, Afghanistan, the Middle East, and North Africa.
Of course it can't really happen in Western Europe in 2015, can it? Chancellor Merkel did everything possible to keep Greece in the Eurozone to prevent its breakup. But her encouragement to accept hundreds of thousands of Muslim immigrants in Germany has brought a backlash throughout the European Union.
Perhaps the defining feature of the European Union is the Schengen Agreement, which permits visa-free travel across its members' borders. Those borders are on lockdown across a growing number of EU member countries in September 2015.
The best laid plans of mice and (wo)men.......