Forced migration can occur due to:
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Environmental disaster: This includes displacement caused by natural disasters such as earthquakes, floods, or climate change effects like rising sea levels.
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Political regime preference: This can encompass situations where individuals or groups flee their home countries due to persecution, war, or oppressive political regimes.
The other options, higher living standards and greater employment opportunities, typically relate to voluntary migration rather than forced migration.
In summary, the reasons for forced migration are primarily environmental disaster and political regime preference.