Who won the war between confederency and union and how?

The Union won the American Civil War, which lasted from 1861 to 1865. The victory was achieved through a combination of superior resources, better infrastructure, and effective military strategies, culminating in key battles such as Gettysburg and the capture of Confederate strongholds. The war officially ended with the surrender of Confederate General Robert E. Lee at Appomattox Court House in April 1865. The Union's success ultimately preserved the United States and led to the abolition of slavery.