Why does Nepal have a history of frequent change of constitution? mention in a paragraph.

Because at the time of it's independence from Rana dynasty, a treaty was signed between Congress ,Rana's and the King. And an interim Constitution was formed in 1950 that charged Nepal into democratic country. And also during Rana dynasty The Rana's announced a constitution allowing some rights to citizen just to protect their rule. But this constitution never came into effect .

the adoption by russian princes of the mongols' diplomatic rituals

the poor lived on the docks by the sea, and the wealthy lived in highly populated urban areas. that is the answer