What are the main characteristics of international population migration after World War II?

Basically, people from developing countries emigrate to developed countries. . After World War II, the losses of various countries in the war made people's lives difficult, and many people could not move away from their dilapidated homes. What about those people? Immigration is not just about finding a good life, a good career, etc. Of course, it will migrate like developed countries.

Migration route before World War II 1. Colonialist expansion and capitalist development II. Great geographical discovery and opening of new routes 1. From the Old World to the New World II. From known developed countries to underdeveloped regions 1. Europeans to America and Africa II. Black Africans were trafficked to the United States. East Asians and South Asians were recruited to the United States. Uneven economic development among countries after World War II 1. From developing countries to developed countries. 2. The number of settled immigrants has decreased. The number of migrant workers (migrant workers) increased 1. Latin Americans go to work in North America. 2. South Asians, South Europeans and Africans go to work in West Asia. Southern Europeans and Africans went to Western Europe. 4. Population migration since the founding of New China, China: [Memory] Causes and characteristics of migration The migration direction before the mid-1980s was 65,438+0. Planned economic system. Strict household registration management system, organized 1. The state dispatches all kinds of personnel from eastern cities to support the construction of western, inland and border areas. 2. A large number of rural population moved from densely populated areas in the east to the northwest and northeast. Since the mid-1980s, the reform and opening-up policy has been initiated spontaneously. Inland moved to the coast. 3. Poor areas are transferred to developed areas. 5. the significance of population migration [understanding] adjust the spatial distribution of population and talents. 6. The impact of population migration on the place of immigration and emigration [Understanding Memory] The impact on the place of emigration: Good effects include reducing the population density of the place of emigration and reducing the pressure of population on the environment. The bad effects include the loss of talents and labor in the emigration area; the good effects include the inflow of talents and the provision of cheap labor, which is conducive to economic development. Bad effects include an increase in population density. The pressure of population on the environment has increased. Factors affecting population migration: [memory] (1) changes in natural environment and socio-economic environment (2) changes in personal needs for life or occupation. Among the factors affecting population migration, economic factors often play an important role. 8. Factors of population migration in China in ancient times and in recent decades: [Understanding Memory] In ancient times, it was mainly war (Yongjia Rebellion, Anshi Rebellion, Jingkang Difficulty), followed by territorial expansion, exile, border defense, etc. In recent decades: mainly national policies, social changes, economic development, personal needs, etc. 1.3 Reasonable population capacity 1 Relationship between environmental carrying capacity and population capacity [Understanding] Environmental carrying capacity refers to the number of people that the environment can continuously support. An important index to measure environmental carrying capacity is the number of environmental population. 2, the concept of environmental population capacity and constraints [memory] environmental population capacity is a country or region in the foreseeable period, the use of local resources and other resources, intelligence and technology and other conditions, in order to ensure that the material standard of living in line with social and cultural norms, the domestic production areas can continue to support the population. Constraints: resources (in direct proportion), the level of scientific and technological development (in direct proportion) and the level of living and cultural consumption (in inverse proportion). 3, the concept of reasonable population capacity: [memory] according to a reasonable lifestyle, to ensure a healthy standard of living, while not hindering the future quality of life of the population, the most suitable population in a country or region. 4. The urgency of maintaining a reasonable population capacity: [Memory] The increasingly serious problems of rapid population growth, urbanization and urban population aging. 5. Measures to maintain a reasonable population capacity: [Memory] (1) The international community advocates keeping the population within a reasonable scale as much as possible. (2) Establish a fair order and ensure that most people have equal rights to pursue a high-quality life.