It created a free-trade area throughout much of Germany and is often seen as an important step in German reunification.
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So, the American side lost this battle: because of this I don't think that it showed whether the Americans would win the war: they lost the battle but not by much, so the final outcome was undecided.
Instead I think that it helped to answer "how the Americans would fight".
But I think that the best answer would be that it showed the Americans that they could win: that they had a good chance at winning. Sadly, this is not one of the options.
Fredrick Douglas hope its helps
It’s 1865 when the 13th amendment was ratified i believe- hope this helped, have a good night!