What if you time traveled and gave guns to americans during the civil war?

The Civil War wasn't won or fought based on technology, since both sides had the same kind of weapons and resources, although a person could travel in time and give them pistols and modern machine guns, the conflict of the North against the South, the struggle for the abolition of slavery and the political struggle would not have been solved, and on the contrary, it had become more bloody and more deaths would have occurred, albeit in a shorter time, since battles would gain faster. The South would have had more chances to win, even with its diminished troops, by using only modern weapons, they would have decimated the northern armies.