It's called 'cause in fact'
According to Aristotle, the essence has its own possibilities because there was no deal no idea why he called this matter. But he had a strong believe in matters and essence that provided purpose for the concerned matter. He believed that it is essence that makes everything to be real. Movement form matter or formless was only complete thorough actualization.
There are different clauses that promote any movement, the formal clause, material, efficient and final clause. For example the material cause of the mind can be the matter that controls it.
If you're referring to the post WW2 period, then it was fairly simple, the United States wanted to create a democratic liberal country that would share their political goals in Europe, while the Soviets wanted to make it into a Communist state that would share their goals and ideals in Europe. Each would have their own central European country to control the remainder of Europe.
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He abolished slavery and started the civil war
