In some parts of the world, migration means by which populations can be managed, either by preventing people entering a country (e.g. immigration controls on the USA-Mexico border), or by moving people from an overpopulated area to an underpopulated area (e.g. transmigration is Indonesia).
Immigration controls
The border between the USA and Mexico is the most closely monitored in the world. Everyday, 800,000 people arrive in the USA from Mexico. In 2001, over 300 million two-way border crossings took place at 43 crossing points. In the same year there were over 19 million predestrian crossings in Texas alone.
There are currently around 9150 border patrol agents working along the 3200km border. After the events of 9/11, President Bush asked Congress to approve the funding for an additional 280 border-patrol agents in 2002.
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