Many Europeans migrated to America after the sixteenth century due to the following reasons:
Source: Conquest, Disease and Trade, Chapter 3
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The question asks for reasons, so a brief list-style answer is ideal for 2 marks. Examiners expect at least two clear reasons. The key points from the passage are: poverty/hunger/overcrowding, religious conflicts/persecution, and the lure of wealth/El Dorado. Mention any two well for full marks. Avoid writing long paragraphs — two or three crisp points are sufficient.