So long as the system is able to contain dissident factions within the liberal and conservative parties who alternate in administering it, it is unlikely to come under serious threat. Its stability seems to be shaken only by catastrophic economic collapse or war.
^^^ CB: In the "sixties/seventies", the civil rights movement and urban riots ( and war) "shook stability" in a period of economic boom.
Isn't the above a description for all advanced capitalist countries and their containment of dissidence, but with more than two parties in some countries ?