Where did the Mongols live before invading china?

im not sure

BUT

In 1227 the Mongol dominions stretched over the vast regions between the Caspian and China seas, bordering in the north on the sparsely populated forest belt of Siberia and in the south on the Pamirs, Tibet, and the central plains of China. This empire contained a multitude of different peoples, religions, and civilizations, and it is only natural to seek the motivating force behind this unparalleled expansion.

so its probably caspia

i just answered it

explanation:

four sitting presidents have been assassinated while in office but the first was abraham lincoln,