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BBC I Wonder : Migrant crises
http://www.bbc.co.uk/timelines/zgtvcwx
Echoes through history
The current migrant crisis in Europe has made headlines around the world as millions seek refuge in countries across the continent.
The scale of the latest crisis has not been seen since the end of World War Two, but tackling mass migration has proved to be an almost constant concern. From Biafra to the Balkans, solutions are rarely straightforward.