West Asia is a developing country, why is it a migration area?

Due to the development of oil in West Asia, the immigrant population has increased.

The reasons of population migration before World War II, the geographical discovery and the opening of new routes after World War II, the unbalanced development and colonial expansion of production in various countries in the world, the regional differences in the relationship between labor supply and demand, the migration from Europe to America, the looting of blacks from Africa to America and Latin America, the migration from China, Japan and India to Southeast Asia and America, and North America and Oceania are still the characteristics of migration from the old continent to the new world. Population flows from developing countries to developed countries and from developed countries to underdeveloped countries. The number of immigrants has decreased, and the number of short-term migrant workers (foreign workers) has increased greatly. Foreign workers are mainly distributed in North America, Western Europe, West Asia, South America and South Africa. The importance of immigration has promoted the economic development of immigrant countries and regions. It is beneficial to relieve the pressure of overpopulation in the host country, but it often leads to brain drain, reduces the population pressure of emigration, provides cheap labor for emigration and promotes the economic development of emigration.