The Union had far greater industrial production than the Confederacy, in many ways this helped the Union, not the least of which was in weapons production. Another way this helped were the quantity of textile mills that could produce supplies for soldiers.
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Marshall plan
If you're asking about other countries... nobody.The Union regarded the matter as a purely internal affair and did not seek outside assistance. All they really wanted was for other countries not to intervene on behalf of the Confederacy, and for the most part they got that, so in a sense it might be possible to say that Britain and France (the most likely allies of the Confederacy) "helped" the north by not helping the south.The Confederacy had hoped to forge an alliance with Britain and France. While those countries were somewhat sympathetic and British ships, at least, made some efforts to circumvent the Union's blockade of southern ports, ultimately both countries realized that it was unlikely that the Confederacy would survive, and the political costs of having supported it would be high.
When Ft. Fisher fell after a massive Federal amphibious assault on January 15, 1865, its defeat helped seal the fate of the Confederacy.
I'm not sure of any specific ways that France helped the Confederacy. However, many European countries continued to do business with the Confederate States because they wanted to purchase the cotton from them.
southerners thought the taz helped one region more than another