I believe it’s D ! I did some research and D seems like the only logical answer.
<span>African americans assisted the construction of the subway system from the inception.</span>
From 1750 onwards a new industry emerged in Britain - the production of cotton cloth. Wool production had previously been Britain's major industry, but cotton had one key advantage - machinery could process cotton fibres better than wool.
An engraving showing slaves picking cotton on a plantation in North America
As a result it was in cotton production that the industrial revolution began, particularly in and around Manchester. The cotton used was mostly imported from slave plantations. Slavery provided the raw material for industrial change and growth.
The growth of the Atlantic economy was an integral part of the growth of exports - for example manufactured cotton cloth was exported to Africa.
The Atlantic economy can be seen as the spark for the biggest change in modern economic history. The Atlantic economy in the 1700s was founded on slave labour.
