Periphery-core migration occurs for economic reasons as people move from rural areas to cities and towns in search of jobs and opportunities. High levels of rural-urban migration in LEDCs can adversely impact rural areas by depopulating them and reducing the workforce for agriculture. Large in-migration to urban areas in LEDCs provides advantages like available workers for industry but can also cause disadvantages like overcrowding, unemployment, and increased pressure on infrastructure and services. Migration can be voluntary where people choose to move or forced such as in situations of conflict, persecution or natural disasters. Political barriers to international migration include nationalism, security concerns, and restrictions to control immigration. One example is the impact of Mexican migration to the United States, which