This is not accurate. The South did not worry about saltpetre.
What about it isn't accurate? Those numbers are from Rains, who wrote a history, thus:
"The caves of Arkansas were rich in nitrous earth, and those of Texas still more so, and these supplied the armies west of the Mississippi river with material for gunpowder. As early as practicable I sent out instructed powder-makers to both those States, who under the directions of the military authorities, assisted to put up the necessary powder mills for the Trans-Mississippi department, which after the fall of Nashville was left necessarily to its own resources.
In the early part of November my time had become so much occupied that it was no longer practicable to attend to the production of saltpetre, and Mr. F. H. Smith was sent from Richmond by the Chief of Ordnance to relive me from its duties. At a later day a separate department was established, called the Nitre and Mining Bureau, which then had the entire charge of its production.
In the latter part of November, by the desire of General Lovell the able officer in command at New Orleans I proceeded to that city and examined the temporary arrangements for making gun powder, and also conferred with him relative to procuring a supply of saltpetre from abroad. He suggested the chartering of the steam ship Tennessee, then lying idle in the river near the city, to proceed at once to Liverpool and take in a cargo of saltpetre and return to New Orleans, or, in case of necessity, to put in at Charleston or Wilmington. The suggestion met my views, and was approved by Mr. Benjamin, then Secretary of War, but was not carried out on account of the effective blockade of the mouth of the Mississippi.
The Confederate Government, however, by its agents in Europe, purchased saltpetre which was shipped on swift blockade runners which arrived from time to time at Charleston and Wilmington.
This proved to be adequate to our wants, and about two millions, seven hundred thousand pounds were thus received during the war and sent to the Confederate Powder Works. The amount obtained from the caves amounted to about three hundred thousand pounds for the same period. Thus the total amount received at the works amounted to about 1,500 tons."
- General George Rains,
History of the Confederate Powder Works
It is English policy to foment the utmost division within all foreing nations.
It's really not.
Also, "British" and "foreign".