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Potential Immigrants to USA ()
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| World Population | |
| Ancestor Cone Size |
The width of the green region represents an estimate of the maximum number of ancestors for in each generation back. This region is referred to as the "ancestor cone", based on this note by Wait But Why's Tim Urban.
For hundreds of years back in time, the cone appears to be a line here because it is dwarfed by the world population. However, eventually the doubling growth takes over and the number of ancestors begins to be noticeable relative to the world population.
In this case, we assume a value of 25 years per generation, and so every 25 years back in time, the number of ancestors at each generation will at most double.
The number of ancestors at a given generation back is of course bounded by the world population, and likely eventually matches it. In reality, due to pedigree collapse (intermarriage), the actual number of ancestors in each generation may be less than than maximum, and so the actual manner in which the ancestor cone may grow is uncertain.
| World Population | |
| Ancestor Cone Size |
- If you load a tree from a GEDCOM file, then the first person listed in the file will be set to the "root" person, and their ancestors will be included. You can change the root by clicking the "Change Root Person" button.
- The method of finding the intersection of a year with the link paths is based on that described in Particle in Cell Consulting's note
- Historical event data from Wikipedia
- Statue of Liberty silhouette from OpenClipArt by GDJ
- The map of Africa is by wikipedia user Martin23230, and published to wikipedia under the Creative Commons Attribution-Share Alike 3.0 Unported License
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