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  A Portuguese prince, Henry the Navigator, becomes fascinated by exploration down the coast of Africa and commissions successive voyages
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  You can put your timespan example here. You can also add links:
https://www.oxfordreference.com/view/10.1093/acref/9780191737589.timeline.0001 - 
  
  Bartolomeu Dias, sailing for the king of Portugal, becomes the first European navigator to round the Cape of Good Hope
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  The French build a trading station on the estuary of the Senegal river in west Africa.
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  Dutch nomads, pressing far north from Cape Town, become known as the Trekboer
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  The paddle steamer Alburkah becomes the first ocean-going iron ship, completing the journey from England to the Niger
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  France and Britain agree colonial boundaries for Senegal and Gambia in West Africa