The UK&Ireland plus Northern Europe were key to driving global migration economy in mid 19th century. Caveats: 1. I wonder

The UK&Ireland plus Northern Europe were key to driving global migration economy in mid 19th century. Caveats: 1. I wonder whether map is understating slave trade in E Africa. 2. Are intra-Asian flows properly scaled? But very interesting. Thank you @alexandreafonso twitter.com/alexandreafons…

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