What inventions was used for the first time during the mongol invasion of china?

Even though both ww1 and ww2 were in many ways the same conflict with basically the same countries facing off against each other, the way each war started was significantly different. the question is how what were the differences on how they started

This document provides the framework for the united states government. it consists of three main parts: the preamble, seven articles, and 27 amendments.

Which is the best description of a political campaign tactic during the ele tion of 1828