Has any country been completely wiped out in history?

For example, the Xixia Kingdom in ancient China was destroyed by Mongolian fighters, and only a small number of people remained after the slaughter, but it has been integrated into the Han nationality or moved out of China, so this country is completely extinct. As for permanent occupation, that is impossible. Occupation only refers to the temporary presence of troops, it should be said that it is permanent occupation. For example, Japan immigrated to the Northeast in large numbers at that time in order to permanently occupy the Northeast, but surrendered and left, so there is no permanence in the world. Whoever has a hard gun is a cow. force