First, next, then, last, finally
Answer:
The Battle of Gettysburg, fought between June 1 and 3, 1863 between Union forces and Confederate forces, was one of the major turning points of the Civil War, as the Union victory stopped the Confederate advance in the territory of the north and left free way for the Union to be able to advance towards the territory of the south.
The battle itself was a massacre, with more than 50,000 dead in total. But in addition to being a military disaster for the Confederacy, it also had implications from a strategic point of view. An eventual southern victory would have implied a clear advance towards New York, which would imply an almost certain victory for the Confederacion. Furthermore, a Confederate victory would have encouraged France and Great Britain to ally with it to defeat the Union, which in those years was a major commercial adversary. Therefore, the victory of the Union in this battle prevented the participation of France and Great Britain in the conflict.
The answer of the question is b
The correct answer to this open question is the following.
I think the border dispute would have been resolved if the American army had not crossed the Nueces River into the disputed land through the diplomatic via, although the issue was "hot" and there was not a good predisposition of México and the United States to resolve it in an amicable way.
The federal government of México defended its idea that the natural border with the United States was the Nueces River, in Texas. However, the United States had a different idea and the US government defend its idea that the border was the Río Grande. And that is how the problem became bigger and bigger until it ended up in the war between México and the United States.
