What kind of migration type did the ethnic minorities migrate during the Western Han Dynasty?

Ethnic minorities who migrated in the Western Han Dynasty belong to nomadic migration type. According to relevant data, population migration can be roughly divided into two types: migration between nomadic people and migration between farming people and nomadic people. Because of the long-term war and the threat of Xiongnu, the situation in Guanzhong is tense and the economy is ruined, facing the burden of economic recovery and development. In view of this situation, Hanting adopted two directions of immigration. The first is to move the population to Guanzhong and enrich the strength of the capital region. The other is to directly migrate the population to the northwest frontier and enrich Guanzhong and northwest China through political forced migration. The purpose of direct immigration to the northwest frontier is mainly to strengthen the defense against the Xiongnu and serve as a bridgehead to counter the Xiongnu in the future.