American soccer writing, history & data.
| League | Abbreviation | Years |
|---|---|---|
| National Association Football League | NAFL | 1895-1900 |
| National Association Football League | NAFL | 1906-1921 |
| National Independent Soccer Association | NISA | 2019-present |
| National Professional Soccer League | NPSL | 1984-2001 |
| North American Soccer Football League | NASFL | 1946-1947 |
| North American Soccer League | NASL | 1967-1985 |