Moving onto reservations meant thag american indians

Which four of these developments were made under mongol rule during the pax mongolica? the extension of the grand canal in china the spread of christianity the spread of weapons that used gun powder the invention of new medicines the establishment of a postal system the invention of geometric models of lunar motion

What do historians call the political,social,or cultural circumstances surrounding an event?

The constitution protects the rights of citizens by limiting the power of government