It started with decolonization. The West was thrown out of its colonial empires by nationalist insurgents of indigenous peoples (Algeria, India, Vietnam, etc). Then, the West was overthrown in those areas where significant Western minorities had established minority rule (Rhodesia, South Africa, Kosovo). Now, the third world is pushing into areas previously inhabited by Western majorities (Israel, the American Southwest, etc).
Eventually, this will culminate in a struggle for control in the very hearland of the Western World (the rest of America, Europe, Australia, etc). The West is running out of places to hide.