The Union Army & The Confederate Army
No. The majority of soldiers from the two opposing sides were both the same race. In fact, members of some families fought on both sides.
The Hutu's and the Tutsi's
A rhombus has two opposing acute angles (less than 90º) and two opposing obtuse (greater than 90º) angles, with the opposing sides being parallel and the sides being of equal length. A parallelogram can have the two acute angles and two obtuse angles, but have sides of different lengths. That is: two opposing sides shorter than the other two opposing sides. All angles total 360º
battle of Gettysburg
You have mixed two event: the Battle of Gettysburg, and Lincoln's delivery of the Gettysburg Address.
The Battle of Gettysburg and The Gettysburg Address.
No Gettysburg happened two years after the war started. It was the second Confederate invasion of the North.
Sharpsburg (antietam) & Gettysburg
No, Jackson was killed in the big battle of Chancellorsville, about two months before Gettysburg. Gettysburg was the next big battle after Jackson's death, and he was sorely missed by the Confederates.
A Parallelogram has 2 pairs of opposing sides that are parallel.
The battle of Antietam and Shiloh were the two bloodiest battles of the Civil war
Oil