The leader that took over after Stalin was Nikita Khrushchev
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They developed lots of new techniques for buildings and constructions. They also brought about incredibly well put together aqueducts that ran for miles. They built military roads and they are still a basis for many things that we build today.
They talked about equality under the law, and also came up with The Twelve Tables, which are very well known today. Christianity was banned in ancient Rome and Christians were punished for a very long time because of this. They were even fed to lions as entertainment.
For Lincoln, allowing American democracy to succeed was compatible with the ideal of freedom; allowing secessionists to destroy it (in response to a democratic election) was not. In other words, Lincoln did not believe that true freedom was letting states do their own thing--and letting the pillars of American constitutional democracy run amok--but instead, in maintaining a union where the great experiment of democracy could flourish. As Lincoln himself said quite clearly in the Gettysburg Address, he was committed to making sure "...that government of the people, by the people, for the people, shall not perish from the earth." I suppose you can argue that Lincoln's vision of freedom was not worth the price, but you cannot deny that he had a vision of freedom--and that, for him, this vision was compatible with maintaining the historic, unprecedented political freedom that was achieved in 1776.