Slavery in Modern Day America

I've always thought that slavery had been abolished in the United States. But what this is unbelievable untrue. What is human trafficking? It's the recruitment, transporting, transferring, harboring, or reception of people for the purpose of exploitation through slave labor or prostitution. Exploitation is defined  as forcing, people mostly women and children into prostitution and other forms of sexual exploitation or slave labor or indentured servitude through the use of fraudulent and deceptive means. Traffickers set up immigration agencies that falsely "help" women get into the country but then strip then of their legal papers and force then to work as prostitutes. Language barriers usually keep these women from getting aid and so they become trapped in a world of forced prostitution. Approximately 50,000 people are trafficked into the US each year, 80% being women, and 70% of those women are forced into prostitution. Read more about it here. If you type into google, "when was slavery abolished in the US?" you'll find that most cites say 1865. But how can slavery be considered abolished when there are people into the United States and forced into prostitution?