American history homework help

Two pages in enough
 
There are hundreds of Civil War battles, but some proved more significant than others. I have offered you a handful of battles. You must determine which battle proved the most significant in the Union’s eventual victory and why.
Evidence:
 
The Battle of Bull Run (1^st Manassas) July 21, 1861
The Battle of Pea Ridge, March 7-8, 1862
The Battle of Antietam (Sharpsburg) September 17, 1862
The Siege of Vicksburg May 18-July 4, 1863
The Battle of Gettysburg July 1-3, 1863
The Battle of Chattanooga September 1863
The Battle of Fort Pillow April 12, 1864
 
Solution:
Determine which battle was most significant in the Union’s victory and explain why.
To determine, look at the battles, at the maps, read the other documents.