What Is the Impact of the Mongol Empire?

In the early thirteenth century, tomujin consolidated power among various mongol houses. He he and then his son ogada, conquered present day iran, the caucasus, ukraine, russia, much of china. His grandson, monke khan, conquered the rest of china alongside his brother, kublai. Meanwhile, another brother, hulagu, took bagdad and killed the ast ubasid caliph,. Only to finally be defeated by the memluk dynasty of egypt. It's a really incredible story. How did these how, over three generations, did this house from the step manage to conquer so