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A breakthrough.
The discovery of gold in Transvaal contributed to the start of apartheid.
The discovery of Penicilin was a major breakthrough in medical science.
Some synonyms of "breakthrough" include: Discovery Innovation Advancement Milestone
The discovery of gold in Transvaal contributed to the start of the second Boer War around 1879. The people of Transvaal did not want the foreigners taking what they thought was theirs.
1518 if you think of "discovery" as being found by Europeans.
Contributed to what? Please ensure specification of the topic of your discussion
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Robert Hooke
Introduced Africa to Christianity through Portuguese, A lot of weaponry were sent to Africa in exchange for slaves . As mentioned slavery increased specially in the Triangle of Trade ( weapons from Europe to Africa, slaves from Africa to America, Crops from America to Europe). After the discovery of Americas, Europeans wanted labor to farm and do the hard work for them when colonizing in America.
Europeans, after columbuses discovery. europeans then (in late 1600s) introduced the africans into the Americas as slaves
A breakthrough is something like a major discovery.