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Four immigration eras in the United States, classified by type of migration restriction and hemisphere.
| Type of restriction | Eastern hemisphere | Western hemisphere |
|---|---|---|
| 1. First Immigration Era: 1789-1984 | ||
| Personal | No | No |
| Numerical | No | No |
| 2. Second Immigration Era: 1875-1920 | ||
| Personal | Yes | Yes |
| Numerical | No | No |
| 3. Third Immigration Era: 1921-1964 | ||
| Personal | Yes | Yes |
| Numerical | Yes | No |
| 4. Fourth Immigration Era: 1965- | ||
| Personal | Yes | Yes |
| Numerical | Yes | Yes |
