Although it's a bit counter-intuitive, Columbia actually never explored North America, instead visiting the other locations on this list instead. This lead to great discoveries but lots of suffering for the local inhabitants.
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Answer:
Vespucci
Explanation:
Vespucci was a bit of a late starter and was well into his 40s before he decided to become an explorer. After a conversation with Columbus in Seville Amerigo was tempted by the fame and vast amounts of money floating round European courts as countries raced to colonise as much land and wealth as possible.
Most immigrants to the United States in the antebellum era came from Germany and Ireland.
There were various reasons why they emigrated into the States, but the most important one was civil unrest in their native countries. Also, they couldn't find jobs home, and they heard that America is a land of freedom and opportunity, so obviously they wanted to be successful too.
