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Legalization of unauthorized: U.S. immigration registry law.
| Year of Act | Entry date | Years in U.S. required | |
|---|---|---|---|
| Shortest | Longest | ||
| 1929 | 1 July 1924 | 5 | 15 |
| 1939 | 3 June 1921 | 18 | 19 |
| 1940 | 1 July 1924 | 16 | 34 |
| 1958 | 28 June 1940 | 18 | 25 |
| 1965 | 30 June 1948 | 17 | 38 |
| 1986 | 1 January 1972 | 14 | 49 |
