The first way is when a foreign force makes a conquest upon them. this results in the conquerors' swords often cutting up governments by the roots. the second way is from the inside,when a single personor prince[king] sets up his own arbitrary will in place of the laws and then dissolution of government is justified.
President George W. Bush's main concerns about the security of the United States relied on terrorism. This led his to advocate for the creation of defense systems around the globe.