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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

Is this statement true or false? before 1850, workers in american mines, mills, and factories were poorly paid, but their safety on the job was always protected by strict laws.

At the casablanca conference, allied leaders signed an agreement to share military technology decided to launch an invasion of southern france agreed to accept only the unconditional surrender of the axis powers agreed to form a scientific team to create the atomic bomb