How did the explorer lifestyle of the vikings affect the way their civilization developed?

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

The solvent union and u. s believed in two different economic systems which was?

What was a major cause of world war i?