A provisional government sometimes is set up when a government is overthrown as a result of warfare or terrorist hostilities or when an economy has been destabilized to the point at which it no longer can effectively be managed under its current governmental setup.Ad. provisional government sometimes is set up when a government is overthrown as a result of warfare or terrorist hostilities or when an economy has been destabilized to the point at which it no longer can effectively be managed under its current governmental setup. Ad.