Mandate of heaven refers to the idea that heaven would bless the authority of a just ruler, but on the other hand be with an unwise ruler. if this was the case, it would give the mandate, or rule, to someone else. true or falsue

   True

Explanation:  The Mandate of Heaven meant that the ruler had a divine blessing, and on the basis of his virtues he was chosen by God to be a ruler. This principle implied that there could be only one ruler because there is only one heaven. However, this rule of one ruler was not limited to one ruler until the end of his life, that mandate was interchangeable. This change concerned the choice of another dynasty, or simply another ruler from the existing dynasty, if the previous ruler did not rule justly, was a tyrant and the like. Then the mandate would be handed over to someone who deserves it according to his virtues. This was the rule of the heavenly mandate, and it can be discussed whether it was always applied or there was political bias, various noble intrigues, blackmail, interests, etc.

true

Explanation:

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof

because the vietnam war was fought in an especially brutal and untraditional way