1698 and 1707. The importation then dwindled but after the Assiento rose to perhaps 30,000. The proportion of these slaves carried to the continent now began to increase. Of about 20,000 whom the English annually imported from 1733 to 1766, South Carolina alone received some 3,000. Before the Revolution the total exportation to America is variously estimated as between 40,000 and 100,000 each year. Bancroft places the total slave population of the continental colonies at 59,000 in 1714; 78,000 in 1727; and 293,000 in 1754. The census of 1790 showed 697,897 slaves in the United States. Not all the Negroes who came to America were slaves and not all remained slaves. There were the following free Negroes in the decades between 1790 and 1860:
| 1790 | ............... | 59,557 |
| 1800 | ............... | 108,435 |
| 1810 | ............... | 186,446 |
| 1820 | ............... | 233,634 |
| 1830 | ............... | 319,599 |
| 1840 | ............... | 386,293 |
| 1850 | ............... | 434,495 |
| 1860 | ............... | 488,070 |
Immigration of Negroes is still taking place, especially from the West Indies. It has been estimated that there are the following foreign-born Negroes in the United States:
| 1890 | ............... | 19,979 |
| 1900 | ............... | 20,336 |
| 1910 | ............... | 40,339 |
| 1920 | ............... | 75,000 |
