The plantation system peaked in the first half of the 18th century, but later on, during the middle of 19th century, there was a significant increase in demand for cotton from European countries, which means there was a need for expanding the plantation in the southern parts of United States. This made the plantation system reach a profound crisis, until it was changed from being forcing slave labour to being mainly low-paid wage labors who contained a smaller proportion of forced labour. The monopolies were insured high profits from the sale of plantation products by having cheap labours, forced recruitment, peonage and debt servitude.