Why do you think the United States and Soviet Union wanted to promote their systems...

Each one wants to promote and remain world powers in their own way. It's like playing cards, whoever has more A's controls the game.

However a long time ago it was foretold who would be a World Power in our day and time. This information can be found in the Bible at Daniel chapter 2, there it talks about World Powers starting with The Babylonian World Power.

There Daniel, who was a prophet, assigned by God, describes what would happen to all the world powers, down to our day. When you read this information, pay particular attention to what happens at the feet of the statue.

This information is not only Bible history but ancient world history as well.
For more information on this subject go to jw.org (World Powers)