The different ages of the native- and foreign-born inhabitants of the United States may be seen from the accompanying diagrams[145] comparing the aggregate population of the United States with the foreign-born. This may profitably be compared with a similar diagram relating to the Chinese in the United States ([Book II, Chap. III, § 3]).
Aggregate: 1870. The figures give the number of thousands of each sex.
| Decade of Life. | Males. | Females. |
| 1 | 136 | 132 |
| 2 | 115 | 114 |
| 3 | 87 | 90 |
| 4 | 62 | 63 |
| 5 | 47 | 44 |
| 6 | 31 | 27 |
| 7 | 17 | 15 |
| 8 | 7 | 7 |
| 9 | 2 | 2 |
Foreign: 1870.
| Decade of Life. | Males. | Females. |
| 1 | 24 | 23 |
| 2 | 48 | 49 |
| 3 | 128 | 114 |
| 4 | 134 | 113 |
| 5 | 107 | 84 |
| 6 | 60 | 44 |
| 7 | 27 | 23 |
| 8 | 9 | 9 |
| 9 | 2 | 2 |