The American civil War (1861-1865) was(is) the biggest war that ever took place on American soil. A tank to the weak central government and the different policy making the country was divided in two. The North (the union as they called it) and the South (or the Confederation). What triggered the war was the question about slavery. The North or the Union banned slavery and was developing very fast in the industrial area and they needed workers. The South however or the Confederation still had practiced and approved slavery and they were against banning it. So the fights started after the Confederation bombed the Union fort made on Confederation territory.
Below photos represent:
Rebel Cannons at Antietam Battlefield: (photo 1)
The Matthews House (Stone House), Manassas, National Battlefield (photo 2)
It is supposed that at least 620,000 Americans died in the American civil war (experts even mention the number of 700,000. Have in mind that the record keeping at that time was with practically non-existent). The casualties divided into Federals and Confederates looked like this:
Civil War artillery at the Chantilly Battlefield in Fairfax, Virginia: (photo 3)
Civil War artillery pieces at the Antietam battlefield: (photo 4)
The Unions’ army had 2,500,000 to 2,750,000 men and had the total loss of 360,222 out of whom in battle died 110,070 and of diseases 250, 152. The Confederate army had from 750,000 to 1,250,000. They operate with the loss of 258,000 out of whom 94,000 were in battle and 164, 00 of disease. You will notice that the deaths of diseases were higher than the deaths out of battles. At that time the medical help was very poor, even the easy wounded died out of infections.
The American Civil War brought this nation together. Since than the Union and the Confederation are called the United States of America and they function as one state and slavery is banned officially in the South too, although it took a bit more lives to finalize it. I think that Abraham Lincoln is the happiest to see US today as he envisioned it, strong, together, and striving to progress, the most democratic society in the world!