Sudden changes in society are often described as revolutions. advances in technology can result in revolutions in science and the workforce. dissatisfaction with a government can lead to a political revolution. under what circumstances is it likely that these changes will occur? are there circumstances in which these changes should not occur?

I think these changes are more likely to occur during a war or maybe when the president or someone important says something that people don't like. Also, when people are under stress they are more likely to start a revolution. I don't think there would be circumstances where people won't make a revolution. People will always feel unsatisfied with the government, so there will always be changes too.

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.

1. ford: gerald ford´s presidency, from 1974 to 1977, faced high inflation, named it public enemy nº1, and created the win program (whip inflation now).

2. carter: president from 1977 to 1981, carter had controversial poitions over abortion, but yet, he enforce the roe vs wade decision, which had pro-choice content.

3. reagan. for his eloquency and powerful speeches in his mandates, from 1981 to 1989, reagan earned this nickname, “the great communicator” .

4. george h w bush: despite many presidents had important roles in managing and trying to end the cold war, it was in bush sr's mandate that the berlin wall was materially destroyed, and he was visited by gorbachev in the uspresident from 1989 to 1993.

5. clinton: defense of marriage act. clinton signed this controvesial act, which defined marriage and spouses in strict heterosexual perspective, that was later declard unconstitutional by the us supreme court.

6. george w bush: in the begining of his presidency, which lasted until 2009, bush jr faced the greatest terrorist attacks in us and probably the worlds history, in september, 11 of 2001.

7. obama: in attempts to cease a great economical crisis, barack obama signed the controversial recovery act in february 2009, which handled 780-billion dollars.