Forced migration can occur due to the following reasons:
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Political regime preference: Individuals may be forced to migrate due to oppressive political regimes, persecution, or conflict that threatens their safety and freedom.
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Environmental disaster: Natural disasters, such as floods, earthquakes, or climate change-related events, can force people to leave their homes for safety and survival.
Greater employment opportunities and higher living standards generally characterize voluntary migration, where individuals choose to move for better opportunities rather than being compelled to leave.
Therefore, the correct reasons for forced migration from your provided options are political regime preference and environmental disaster.