The Mamluk Sultanate of Egypt put an end to the Mongol Empire conquering by defeating them in Palestine under the direction of Baibars. The end of the Mongol Empire came in 1260 at the Battle of Ain Jalut.

The Mongol Empire under Genghis Khan started the conquest with small-scale raids into Western Xia in 1205 and 1207. By 1279, the Mongol leader Kublai Khan had established the Yuan dynasty in China and crushed the last Song resistance, which marked the onset of all of China under the Mongol Yuan rule.

The Mongols were a tribe/clan in Mongolia, they were nomads and depended on raids for incone and wealth. The Mongol empire was built by conquering with the Mongolian advanced bow and horsemanship. Also, the Mongols drove fear into neighboring kingdoms, so they faced less resistance. Anyone that wanted to face mongols, it was futile.

which raids

the forceful unification of Mongol tribes by Termujin

the kidnapping of Termujin's wife by a Mongol tribe

the payment of tributes to the Mongol army

the invention of trebuchet by Mongol engineers

One of these four!