during the Second Industrial Revolution, railroad expansion increased settlement in the East. the North. the South. the West.

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

Why was the al-qaeda terrorists organization established

Which of these were achievements of the safavid dynasty? check all that apply.