What is the primary source of marijuana in the U.S.A.?

The primary source of marijuana in the U.S.A. has historically been Mexico. This is attributed to several factors, including the geographical proximity of Mexico to the United States and the longstanding cultivation of cannabis by Mexican drug trafficking organizations. These organizations have been known for producing and smuggling large quantities of marijuana into the U.S. market, significantly influencing the marijuana supply over the years.

Additionally, while other countries like Colombia and Canada have played roles in marijuana production and supply, Mexico remains the most notable source, especially before the recent shifts in legalization trends and domestic cultivation in the U.S. As states continue to adjust their laws regarding cannabis, the dynamics of marijuana sourcing may evolve, but for a long time, Mexico has been the most significant supplier to the American market.