The Union army under Grant was composed of regiments from many states.
You may be referring to the new army raised by John McClernand in Illinois, where he had been a politician of great influence before the war.
The status of this 'private' army, operating alongside Grant's own force, caused much confusion and Grant eventually fired McClernand for insubordination.
Answer The Battle of Champion's Hill, just east of Vicksburg, was fought on 16 May 1863. This battle was fought out in the open and was a set-back for the Confederates. This forced them to return to the defenses of Vicksburg, which began the siege. The siege ended when General Pemberton surrendered Vicksburg on 3 July.
The answer is arguable. I say that politically, Gettysburg was the most important battle. Strategically, Vicksburg was the most important.
The Battle of Tippecanoe.
The Battle of Big Black River Bridge was fought on May 17, 1863 in Mississippi. It was an important Union victory in that the Confederate forces were forced to leave the field and take refuge in the City of Vicksburg. No Southern army could rescue Vicksburg and Union General US Grant began a siege on Vicksburg which would cause Vicksburg to surrender on July 4, 1863.
The campaign to sieze Vicksburg took place over a four state area around Vicksburg, Mississippi (Tennessee, Arkansas, Louisiana, and Mississippi).
The Battle of Tippecanoe was fought near what is now known as Battle Ground, Indiana, on November 7, 1811. It is in Tippecanoe County.
The turning point was not a battle but a siege, the Siege of Vicksburg.
Vicksburg is in the state of Mississippi, which joined the Confederacy. So its President was then Jefferson Davis. After it was liberated, it was occupied by Union troops, along with the whole of the Mississippi, so its president was effectively Abraham Lincoln.
because they wound not let them us the Mississippi river for transportation
The first of several battles against Vicksburg, Mississippi took place in the Spring of 1862.
The Battle of the Bulge, fought against the Germans, in Belgium, during the winter of 1944-45.
it's in Mississippi.