How many times has America been discovered?

People have been living in the Americas for thousands of years. But how many times have people discovered the Americas for themselves in history?

Sources:
https://www.smithsonianmag.com/science-nature/borne-on-a-black-current-31467673/

https://web.archive.org/web/20190110021629/https://www.cbsnews.com/news/did-chickens-beat-columbus-to-new-world/

https://grahamhancock.com/wakefieldjs1/

https://www.dailymail.co.uk/sciencetech/article-3152556/Did-China-discover-AMERICA-Ancient-Chinese-script-carved-rocks-prove-Asians-lived-New-World-3-300-years-ago.html

https://histmyst.blogspot.com/2009/06/discovering-americaagain-and-again.html

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