The categories are political, social and economic reason for migration.
List of Reasons:
• Ireland’s potato crop failed - economic.
• “Poor law” taxed Ireland’s small farmers. - political.
• New factories in Germany put people out of work - economic.
• A freedom revolution in Germany failed - political.
• Few jobs existed for workers in China - economic.
• People in some foreign nations were persecuted for their beliefs - political.
• People searched for adventure - social.
• A rumor spread in Germany that America would stop immigration - social.