Why did Europeans suddenly need to buy slaves from Africa?

The nineteenth century saw immense changes in Africa. Some were driven by famine and disease. Some changes were the result of the territorial ambitions of African rulers. As the century prog

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Explanation:

the outcome of 1970 oil crisis in united states was that, they began to search ways on how to reduce oil.

in 1970 was a period when there were energy and oil crisis. those who were major centers for industrialization were forced to keep way from supplying of petroleum.

some of the result of this crisis was economic growth became stagnant because prices of oil surged.

due to the increased prices some countries like mexico and norway benefited.