The 1870 census shows that in the ex-Confederate states there were nearly 211,000 foreign born peoples plus 459,901 person who had foreign born parents.

The number of foreign born peoples in the same states in 1860 came to 233,455.

Add Native Americans from Okalahoma and the Jewish religion (there were 14 synagogues with a total value of $218,000) and somewhere between 500,000 and 700,000 free peoples in the South in 1860 would fall under the catagory of having different ethic backgrounds in 1860 using the same standards the wikipedia author did.