Requiring strict obedience to an authority, such as a dictator

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 country aided north korea in the korean war?

Why did the british government relax rules regulate trade for the american colonies in the late 1600s?