The British initially became involved in the slave trade during the 16th century. By 1783, the triangular route that took British-made goods to Africa to buy slaves, transported the enslaved to the West Indies, and then brought slave-grown products such as sugar, tobacco, and cotton to Britain, represented about 80 percent of Great Britain's foreign income. British ships dominated the slave trade, supplying French, Spanish, Dutch, Portuguese and British colonies, and in peak years carried forty thousand enslaved men, women and children across the Atlantic in the horrific conditions of the middle passage. Of the estimated 11 million Africans transported into slavery, about 1.4 million died during the voyage.