I like the previous assertions, and in particular post number 5.  Throughout history, revolutions have resulted in some level of dissatisfaction.  If we were to look at this philosophically, voices were either being relegated to the margins or being outwardly silenced, and change was demanded.  There comes a point in experience when people feel that a point of no return has been reached, and a point where people say aloud, "Enough."  The ability of people to overthrow their daily economic and political lives arises out of their ability to envision what can be as opposed to what is.  They do this in accordance to their perception.  This is what causes revolutions in all forms- intellectual, scientific, technological, political, moral.

人民基本需要得不到满足时往往发生革命指获取食物、衣物、住所等这为革命领袖煽动造反创造了正确环境另一元素倾向于长期侵犯基本人权。 多数革命领袖往往利用坏局并吸引大众和他们无法获取的东西以争取同情他们的事业。需要一些魅力和这些领袖常成为民英雄

一些理论家(如卡尔马克思)认为革命是一种自然进化和反射,反对资本主义社会对工人的剥削为此,革命往往以特定事业的名义启动,但并不总是源源不断

I would only add that another element is the lack of hope, hope that their lot will improve, and hope in the fact that they will be able to gain enough "power" to gain some control over their economic/political lives, perhaps through elections.  I am thinking of the situation of the poor in our large cities at the turn of the century.  Perhaps we've never had a revolution in this country because people are so spread out that uniting for a revolution was difficult at the turn of the 20th Century.  I really think it's due to the fact that upward mobility has always been a part of the American economic system.  We have a large middle class, and entry into that class remains possible --- through hard work, some good luck, whatever.  If that hope were taken away, if we had a large underclass that had neither money nor power, then I think we would see more revolutionary activity.  There were communists and anarchists during the "Guilded Age," but it never really caught on.  I believe this is why we are so aware of maintaining a functional middle class through our economic difficulties today.

反之,你将如何在一个像我们这样大的国家里发生革命?我们偶尔会小革命(共和党外出,民主党外出,共和党外出,共和党内.)。和似已足够可能正因如此,