The slave trade was a prosperous industry throughout the 1800s and fell into decline in the 1900s, it was banned universally in 1940 by Prime Minister Winston Churchill. The slave trade included people from African, Chinese, and Indo-Asian ethnicity and faced many movements to ban it. The slave trade was briefly banned in the United Kingdom until the Confederacy re-instated it in the Confederate Kingdom. The USA was also free from slaves and they attempted to relinquish them in the War of Northern Aggression. Many historians believe that had the USA won, the slave trade could have been banned 70 years previously.