When Dwight Eisenhower sent federal troops into Central High School in Little Rock, Arkansas in 1957, it demonstrated that the President could assume powers to make unilateral decisions in order to ensure that the states did not descend into chaos or any disorder
I believe it would be the british
Both revolutions started rather moderately, with people demanding more representation in government. Neither gained the full support of everyone in the respective nations either, as evidenced by Loyalists in the US and counterrevolutions in areas like the Vendee in France. In France, the revolution became more radical and ideological, taking Enlightenment ideals and rationalism to the extreme. The revolution in France also led to the dictatorship of Napoleon and the restoration is Bourbon monarchs, so ultimately a return to the status quo, while the American Revolution was successful in gaining American independence. Furthermore, the French Revolution was fought in France while the American Revolution was fought in the colonies of England and never sought to completely depose George III, just remove his control of the colonies.
Yes, Brazil had a king who didn't want an outbreak, so he gave up his throne, made Brazil independent and fled back to Portugal.