Yes, CBD is legal in all 50 states. The 2018 Farm Act removed hemp from the Schedule 1 Controlled Substances list. This essential legalized the use of cannabis plants containing less than 0.3% THC. CBD products made with hemp CBD must have less than 0.3% THC.
The FDA has stated that it is illegal to sell any hemp-based CBD product that is marketed as a dietary supplement or having therapeutic benefits unless approved by the FDA.