What most contributed to the strength of the ancient Chinese dynasties

If there were no system of checks and balance,the process of government would eventually fall apart. do you agree with this opinion? why or why not?

Between 1518 and 1548, spanish conquistadores conquered most of the new world, motivated by the a) desire for scientific knowledge. b)  to urge to claim more territory for spain. c) belief that an all-water western route to the orient existed. d) desire to advance national glory, serve god, and seek personal wealth.

Which institution includes radio televisions and movies