“The United States needs to recognize we have a problem that’s second only to the problem we have with ISIS (Islamic State),” the Atlantic Council’s Peter Pham told USA Today. “We have a group holding territory and shooting down jet fighters. … If Nigeria collapses — it is the strong state in the region — there are no strong states to contain what would happen if Boko Haram succeeds in carving out an Islamic state in that area.”

Radical Islamists are immeasurably more dangerous when they organize themselves into states or state-like entities than when they hide in the shadows and strike like serial killers with bombs. Terrorist organizations are bad enough, but radical Islamist state-like entities such as ISIS, the Taliban, Hamas, and Hezbollah are menacing enough to start wars.

The United States isn’t directly involved in all these wars—Israel battles Hamas and Hezbollah, and the French took out the proto-Islamic state in Northern Mali—but if a huge swath of Africa collapses and Boko Haram metastasizes fully into an ISIS-linked entity with staying power, what happens in Sub-Saharan Africa may no longer stay in Sub-Saharan Africa.