Answer:
by refusing to recognize the Confederacy.
Step-by-step explanation:
Britain and France never formally accepted the Confederacy and the reasons behind it were both economic and political. Britain wanted a stable United States which would bring more profit to them. And it was evident from the fact it stopped its trade with southern states, which weakened the war material supply to Confederacy. Secondly, as the foreign intervention seemed impossible the Confederacy's will to fight has suffered considerably.