First, your knowledge about the crusaders is not correct, the Crusades wars took place between the 11th and 15th centuries, so it started 500 years after the emerging of Islam, and therefore, all the cities attacked were Muslim Cities with minorities from all other religious living in peace with the majority of Muslims. They mercilessly massacred Muslim peasants and burned their young children alive; they have directed their violence towards any dark-skinned peoples and those who simply wore different clothes from them, regardless of their religions. They have slaughtered around 10,000 Jews who they were defending their temple in Jerusalem.
Second: Ottoman Empire occupied the Arab world, and then, the British promised that if the Arab support the British against the Othman Empire, they will help the Arabs to establish their national Arab homeland. But as always the case, the Britsh along with France and Russian secretly have agreed through Sykes–Picot Agreement to occupy and control the Arab world.Typical Western attitudes, betraying, treachery and selfish. The never care about others, the only thing they care about is their interests
Third: Those whom you call jihadist have killed more Muslims, and they consider all Muslims (more than 1.6 billion) as Nun-Muslims and they have conducted many attacked in the mosques while Muslims were praying without any mercy. Regardless of their believe or interpretation to Islam, they are not Muslims and do not belong to Islam by their acts.