Answer:
The period of time now described as the Common Era is based on older Christian periodization that divided time into a period before Jesus's birth and a period afterward.
Explanation:
The Union Army was larger, and was able to draw on a far larger population for replacements. The Union Army had better artillery, and was able to manufacture their own artillery. The Union's forces were made up of a far larger percentage of immigrants, and in general had good junior and mid-level officers, and a lot of rather mediocre top level officers
