Some push factors were the chance to get rich, Dry farming, owning land, escaping the nightmares of the south ( slaves ). There were also longhorns to sell. Some pull factors were relatives and spouses not wanting them to go.
Answer:
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One reason for the mass migration of many Irishto North America in the 19th century was <span>a series of crop failures
This is what sent them to North America in the 19th century.
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Very smooth surfaces such as glass mirrors and polished metals
There was the compass and the astrolabe