In the United States, the antislavery contention that slavery was both economically inefficient and socially detrimental to the country as a whole was more prevalent than philosophical and moral arguments against slavery. In Virginia, as the economy shifted away from tobacco towards less labor-intensive wheat crops, more slaves were freed between 1783 and 1812 than any time until 1865. There was the potential, in many Southern minds, for a relatively short transition away from slavery. However this perspective rapidly changed as the worldwide demand for sugar and cotton from America increased and the Louisiana Purchase opened up vast new territories ideally suited for a plantation economy.