Florida was Queen

In Phosphates and Phosphoric Acid.
Florida peebles was a dominant raw material.
Until now there is a good number of Phosphoric Plants in that southern State.
History of Phosphate Chemical Processing and Phosphogypsum in Florida

Until the 1950s, fertilizer manufacturing facilities were relatively small and produced fertilizers tailored to the soil needs of area farmers, commonly within a 100-mile radius. Prior to 1950, only 4 million tons of primary nutrients were produced yearly. But in the late 1940s this began to change. Domestic agriculture and industry, as well as European and Western Pacific markets devastated in World War II, increasingly requested these nutrients. The demand to deliver more phosphate to the farmers at lower costs changed the way fertilizers were produced. In the 1960s, phosphoric acid replaced normal superphosphate as the primary fertilizer commodity, turning what had been strictly a mining business into chemical production. This was especially true in Florida, which produces approximately 75% of the phosphate rock mined in the U.S. Phosphate rock mined in Florida is no longer sold. It is exclusively used by the mining companies, primarily to make phosphoric acid, almost all of which is used in the production of phosphate fertilizers.