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You can buy "Organic" tofu from a number of sources. Some of them (2 that we know of) are produced with American organic soybeans and have plants in the USA. But read the labels carefully. If you are avoiding preservatives found in processed foods you may want avoid some organic brands. Most commercially packaged organic tofu can be labeled organic because they are made with organically grown soybeans but to ensure a longer shelf life calcium sulfate is added to give it stability.
Calcium sulfate, a food additive used to stabilize and firm foods and regulate their acidity levels, is found in a variety of processed foods. In the amounts typically found in food and supplements, calcium sulfate isn't likely to cause adverse effects and is generally regarded as safe by the U.S. Food and Drug Administration.
Fresh fruit and vegetables aren't likely to contain calcium sulfate, but processed versions are. This includes processed fruits, dried vegetables, canned vegetables, vegetables in sauce and precooked vegetables. Buy fresh or frozen fruits and vegetables if you're trying to avoid calcium sulfate.