Why was the great wall of china built?

Is interest in the arts a characteristic of life in athens, sparta, or both? i need right answer athens sparta athens and sparta

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 were four reasons for the decline of spain as a world power