For a radical, the world is divided into two parts. One is the House of Islam, Dar El-Islam. The idea of a geographic-religious division is not mentioned in the Quran nor in the Hadiths, but it was suggested for the first time by the Sunni jurist Abu Hanifah, founder of the Hanafite School. Dar al-Islam is the land controlled by the Muslims during the first three caliphates: the conquests of Mohammed (until 632), from the orthodox Omiya Caliphates (until 750). In the House of Islam, the Shaharya was imposed as a law, an idealized period of the history of Islam to which they wish to return to. A good Muslim cannot, in any way, renounce the re-imposition of the glory of the House of Islam. There is one truth, Islam, and in the future, everyone will be Dar al-Islam. Israel is unacceptable because it occupies Dar al-Islam. Facing the House of Islam, there is Dar al-Harb (literally “House of War”), which is the land inhabited by non-Muslims who they will have to fight if they attack Islam or if the sole truth is imposed via Dawa. The aggression could also be through the cultural exportation of their Yahiliya. The fiqh establishes that the non-Muslim regions belong to Islam, as well as the goods of those who profess other non-Muslim religions and must be returned to its law when circumstances allow it. Sometimes, Dar el-Hudna (truce) is used. It is a territory in which an agreement of non-belligerence has been signed between battles. This division in the world comes from classic Islam and, currently, it is used in an aggressive way and with political-religious purposes by Islamic fundamentalists.
In green, the House of Islam (includes El-Andalus – Spain); in white Dar El-Harb (Source: Wikipedia)