Food for thought for those in many countries around the world who wish to permanently stop immigration of ‘foreigners.’
When the first migrants left Africa 75,000 years ago for the Cradle of Civilization — modern Iraq and Kuwait — Stoneking and his team estimate there were fewer than 100 people. They suggest there were just 15 men and 26 women. They also point to a Bering Strait crossing, from Asia to North America, around 15,000 years ago, as is commonly accepted.
Source: M. Stoneking, et al. Human paternal and maternal demographic histories: insights from high-resolution Y chromosome and mtDNA sequences. Investigative Genetics. 2014.