Which nation tested a nuclear weapon underground in 2009? a. russia b. north c. korea d. south korea

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 did some states believe they had the power to overturn federal laws?

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?