USA - Jihadist leaders — led by the Muslim Brotherhood and aligned Islamist movements operating both overseas and inside the United States — have long treated mass migration, now weaponized through the exploitation of modern immigration systems, not as a humanitarian phenomenon but as a deliberate strategy of conquest meant to penetrate, subvert, and ultimately remake the United States from within. Hijrah, Schweizer explains, was never merely about movement. Migration is “critically important” for da’wah — the effort to spread Islam by inviting others to understand and adopt it — and equally important in establishing an Islamic state or durable political power base inside a host society.