Jihad, by violence and by stealth. Three main points (but read the whole post):
The US's existence, rather than anything we do, is what angers the jihadists. Thus, attempts at conciliating them are at best useless.
Jihadists are as open to peaceful means of conquest as to violent ones.
Many Muslims—that is, many millions of Muslims—who don't support violent jihad, support the stealth jihad.