The U.S. ranks 145th in slavery

According to the Global Slavery Index, 2014, an estimated 0.019% of all the people in the United States are held in slavery. That is enough to make the United States rank one hundred forty-fifth out of one hundred sixty-seven countries ranked in that category. Mauritania ranks first, with an estimated 4% of its people held in slavery.

Table taken from http://d3mj66ag90b5fy.cloudfront.net/wp-content/uploads/2014/11/Global_Slavery_Index_2014_final_lowres.pdf

The U.S. ranks 67th in slavery

According to the Global Slavery Index, 2014, there are an estimated 60,100 people held in slavery in the United States. That is enough to make the United States rank sixty-seventh out of one hundred sixty-seven countries ranked in that category. India ranks first, with an estimated 14,285,700 people held in slavery.

Taken from Global Slavery Index, 2014
http://d3mj66ag90b5fy.cloudfront.net/wp-content/uploads/2014/11/Global_Slavery_Index_2014_final_lowres.pdf