No.
Sorry, you're wrong. The north did lose more men than the south. Northern casualties: Battle deaths: 110,070; Disease, etc.: 250,152; Total 360,222. Southern casualties: Battle deaths: 94,000; Disease, etc.: 164,000; Total 258,000.
> Sorry, you're wrong.
You're responding to the wrong question. Remember, the original question was "Is that why...?"