Approximately when did modern humans migrate to north america?

An essential theme in human evolution is migration and development into regions of the globe not previously occupied. Fully modern humans migrated to Australia about 40,000 yBP and to North America and South America by 15,000 yBP. By the start of the Holocene, humans lived on all inhabitable continents (excluding Antarctica). 

- "the past is made of multitudinous items ranging from anything that can be collected, recollected or assessed to originate in the past. as such, the past is a gallimaufry of particulars that may not have been related in any way. however, the human mind seeks organization to understand concepts and other things. the human mind therefore seeks relationships in explaining and studying the past. history being a humanity, dictates that historians have to serve this human trait by bringing structure to details of the past. historians do this by creating interpretive frameworks that capture as many details as possible."

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equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.