He wanted to make sure the men that sacrificed their lives for a cause, and that cause be a just one. He wanted to preserve the union at all cost, as well as give all men equality and liberties that they deserved. That was the cause he found necessary, and the cause our men rallied behind.
Thats what I think at least,
Hope it helps.
I think it's Indus. I looked it up and it said that it 'developed in the 3rd millennium BCE, making it one of the earliest of the world's civilizations.'
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