In concert with the growing import of Christian missionaries and luxury goods, the slave capture and exports through the Kongo lands grew. With over 5.6 million human beings kidnapped in Central Africa, then sold and shipped as slaves through the lands of the Kongo people, they witnessed the largest exports of slaves from Africa into the Americas by 1867. According to Jan Vansina, the "whole of Angola's economy and its institutions of governance were based on the slave trade" in 18th and 19th century, until the slave trade was forcibly brought to an end in the 1840s. This ban on lucrative trade of slaves through the lands of Kongo people was bitterly opposed by both the Portuguese and Luso-Africans (part Portuguese, part African), states Vansina. The slave trade was replaced with ivory trade in the 1850s, where the old caravan owners and routes replaced hunting human beings with hunting elephants for their tusks with the help of non-Kongo ethnic groups such as the Chokwe people, which were then exported with the labor of Kongo people.