"It is estimated that the acreage required to grow the cotton, sugar and timber imported by Britain from the New World in 1830 would have been somewhere between 25 and 30 million acres - or more than Britain's total arable and pasture land combined. By this time some European countries were refining sugar from beets, but this would have also required vast acreage. Wood could, perhaps, have been imported from elsewhere and was anyway not mainly logged by slave labourers. But as Pomeranz observes: raising enough sheep to replace the yarn made with Britain's New World cotton imports would have required staggering quantities of land, almost nine million acres in 1815 ... and over 23 million acres by 1830.' One might add that cotton yarn was much more suitable for early industrial processes than wool, and that the price paid for each pound of raw cotton dropped by one half between 1790 and 1820 as an expanding slave population, the new cotton gin and steam transport opened the inland states to cotton cultivation. While the acres of fertile land were an 'ecological windfall', the forced labour of several million enslaved people brought them swiftly into cultivation. As late as 1860, six million slaves toiled in the fields of the American South, Cuba and Brazil, producing vast quantities of cotton, sugar and coffee. The thousands of millions of hours of slave toil helped to underpin the global ascendancy of Victorian Britain. Overall, enslaved people on the plantations of the Americas made a large and measurable contribution to British prosperity. While the idea of inherited guilt is wrong-headed - we are not responsible for our forebears' crimes and misdeeds - the idea of inherited privilege is perfectly valid."