You have not read your islamic history then.  For the last 1400 years or so muslims have been engaged in a conquest of the world.  The islamic empire that exists today, from Morocco to Pakistan is a testament to that long jihad.  Today they are attempting to finish that jihad which stalled after, ironically, islam itself suffocated the expansion utterly by the 18th century, having got no further booty to pay for it, and having crushed all resources that would produce prosperity and progress.