WI Dupont does not corner saltpeter market?

The U.S. War Department discovers that it has less than a year’s supply of saltpeter, a main ingredient of gunpowder. All commercial quantities of saltpeter are imported from India through Britain. After a secret meeting in Washington, Lammot du Pont, grandson of the founder, is sent on a mission to London to corner the market ostensibly for his own company, but in fact, for the government. He secures enough of the raw material to provide for U.S. needs for the rest of the war.
What if Dupont doesn't corner the market?
 
Are we saying that he's unable to corner the market due to normal commercial competition, because someone friendly to the Confederate States of America blocks his efforts or because someone hostile to the United States - a distinct matter from supporting the CSA - blocks his efforts? Depending on which of these it is is going to make a big difference.
 
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