Here are the answers to your questions:
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What source of labor did Chinese and Irish immigrants provide during the mid-19th century?
- Built railroads (This was a significant contribution by both Irish and Chinese immigrants during this period.)
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What economic factor brought about rapid urbanization?
- Opportunity for jobs (The promise of employment in urban areas attracted many people, leading to rapid urbanization.)
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What additional factor helped contribute to industrialization in the United States?
- d. Increase in available labor source (The influx of immigrants provided a large labor force which was crucial for industrial growth.)
If you have any more questions or need further information, feel free to ask!