1975 was the year Vietnam was reunited
This is likely King John. In 1215 the Magna Carta was signed which limited the power of kings over his subjects. This granted people certain rights and is marked as the first point of this in English History.
Here's an excerpt from Wiki-pedia:
"Magna Carta Libertatum<span> (</span>Medieval Latin<span> for "the Great Charter of the Liberties"), commonly called </span>Magna Carta<span> (also </span>Magna Charta; "(the) Great Charter"),[a]<span> is a </span>charter<span> agreed to by </span>King John of England<span> at </span>Runnymede<span>, near </span>Windsor, on 15 June 1215.[b]<span>First drafted by the </span>Archbishop of Canterbury<span> to make peace between the unpopular King and a group of rebel </span>barons<span>, it promised the protection of church rights, protection for the barons from illegal imprisonment, access to swift justice, and limitations on </span>feudal<span> payments to </span>the Crown<span>, to be implemented through a council of 25 barons."</span>
B.68.5×10^-8 is the only possible answer
The Han dynasty tried to fix the problems other dynasties had fallen to, such as government that was too centralized or fragmented. Instead, Han Gaozu allocated power to his family. This didn't work too well either, but the dynasty was still successful.
The Qin dynasty was very short, yet of great importance. The founder, Qin Shihuangdi, established centralized rule and divided China into provinces. He relied on his own loyal servants to rule the provinces rather than established nobility and disarmed regional military forces.
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</span>The Zhou dynasty established the Mandate of Heaven, a belief that a ruler's authority came from a higher power and could also be taken away if he acted unjustly. In addition to losing office, a ruler could sometimes have further consequences, like the destruction of his ancestral temple.
