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They had a big enough Navy to blockade the Southern coast, to prevent them exporting their plentiful cotton for war supplies.
The most talented President the Americans ever had
I assume this is about the Civil War. Northern Historians frequently named battles after bodies of water, rivers, or streams; while Southern Historians preferred to name battles after local towns or cities. Thus, The Battle of Shiloh Creek occurred at Pittsburgh Landing. You will sometimes even see a difference of opinion as to who won a particular battle. The great Union victory of Antietam Creek was also the site of the great Confederate victory of Sharpsburg, Maryland.
Like you said, the Union won because of many advantages such as, more resources, higher population, more farms, larger army, a navy, e.t.c.
While it wasn't immediately following, the Battle of Antietam and the Union victory there gave President Lincoln the push to issue the proclamation. The Emancipation Proclamation was issued on January 1, 1863.
They had a big enough Navy to blockade the Southern coast, to prevent them exporting their plentiful cotton for war supplies.
The most talented President the Americans ever had
What changes taking place in the country contributed to Jackson's victory
France
The Spanish victory over the Aztecs in the initial phase of western colonialism in the Americas may be attributed especially to three factors. First, of course, the Spanish technological superiority in fire-arms and body-armor, among other factors, strongly contributed to their victory. Second was the clever use that the Spanish made of allies -- enemies of the Aztecs who were emboldened by the presence of the Spanish. Third, it should also be mentioned that deception and self-serving diplomacy contributed strongly to the final victory of the Spanish invaders.
France
Great Britain and France
Many believe that the hot humid climate largely contributed to the Haitian victory over the French. Especially, the mosquitos and malaria suffered by the French enemies.
Many historians suggest that Cold Harbor in Virginia was the last Southern victory. It was a tactical victory, but it did not stop Grant's advance; so, strategically, it was not really a victory.
Robert E. Lee
VE day or simply V day
Historians consider Chancellorville to be Lee's greatest victory.