Who makes most of the economic decisions in the united states

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

American troops were worried about cantracting in cuba a. yellow fever b. hepatitis c. polio

What role and side did italy fight on during world war 1? why did they change sides? write this in your own words.