The 10/40 Window — the band of countries between 10 and 40 degrees north latitude, running from North Africa through the Middle East to Asia. That’s where most of the world’s unreached people groups lived, especially Muslims, Hindus, and Buddhists.
The term itself was coined by Luis Bush right at the end of the ‘80s, in 1989-1990. Before that, folks just called it the “resistant belt.” It became a huge rallying point for missions in the early 90’s.
That’s where your migrants are coming from. They’ve broken out of the 10/40 Window and they’re coming to take your country and proselytize you - and you’re letting them do it.