<span>Foremost, the Mongols produced a charismatic leader, Genghis Khan, who united the Mongol tribes in a dream of conquest and expansion.The Mongolian horse, a small and very tough infantry horse which could move very quickly and run long distances. Mongol troops were all horse-mounted and could move very quickly.The Mongol bow was a very small composite bow which could accurately shoot an arrow more than 200 yards. Combined with the fast-moving horse mounted infantry, the Mongols had a great advantage.Mongol tactics focused on speed and mobility. If a city quickly surrendered, they were lenient, but if it resisted, they were ruthless.<span>When necessary, the Mongols were willing to co-opt needed talent. For instance, when they needed to lay siege to a city, they would rely on Chinese siege engineers to lay siege to Baghdad. Compared to the empires they conquered, they weren't racist in how they used people.</span></span>
The best and most correct answer among the choices provided by your question is the third choice or letter C which states that "Northern Whigs and Republicans supported the Compromise because it brought Kansas and Nebraska into the Union as "free" states, while Southern Democrats were appeased with the repeal of the Tariff of 1832." This is the <span>BEST description of why the Compromise of 1850 was successful in defusing the sectional conflict between both sides of the slavery issue.</span>
<span>Kepler's laws of motion helped overturn the earlier Aristotelian astronomical system which believed that the sun and planets revolved around the Earth. In order for the older system to work, a complicated mechanism known as "epicycles" was required to make the visible motions match the theory.</span>
