In 1800, a son from a rich family of refugees from the French Revolution in America,after a survey of business opportunities in America, wrote
There already exist in the United States two or three mills which make very bad powder and which do however a very good business. They use saltpeter from India which is infinitely better than that which is produced in France but they refine it badly.
The son was Eleuthère Irénée du Pont, the family was the Du Pont family – and their firm is now known as EI du Pont de Nemours and Co. EU du Pont's expertise in manufacturing saltpeter came from his training with the French Agency for Powder and Saltpeter (Regie royale des poudres et Salpetres) – and under the tutelage of Antoine Lavoisier, the French chemist, he boasted.
Behind the Dupont fortune was Indian saltpetre. Behind Lincoln's success in the American Civil War was saltpetre. Behind Anglo-French confidence against Germany in WW1 was the control of the saltpetre deposits from India. Germans were able to sink many of these British saltpetre shipments. In turn, Germans with the Haber-Bosch process, in BASF factories, continued the war – without Indian saltpetre or Chilean nitrate supplies