The original FM broadcast band in the United States until 1946 was on 42 to 50 MHz with 0.2 MHz channel spacing. This band was abandoned after World War II and is now allocated to fixed, mobile, and land mobile radio services.
The name "FM band" is misleading, since one can transmit FM on any frequency. All of these bands mentioned are in the VHF (very high frequency) band which extends from 30 MHz to 300 MHz. Nevertheless "the FM band" is usually understood to refer to FM sound broadcast Band II. The technically correct terms "VHF" were previously in common use within the EU ("UKW", Ultrakurzwellen = Ultra short wave, still widely used in Germany).
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