> expedited the fall of Soviet Union by forcing them into expensive competition?

Nobody forced the Soviet Union into anything. I think the soviet leaders knew that the system in the West AT THAT TIME was simply better in all ways imaginable and the comunism utterly failed at its mission -- the workers in the West were enjoying a much much better life that those in communism, and having lost that ideological space, they thought they could override common sense on the battle field -- surely, if you win the space race, more olympic gold medals or on the battlefield, then communism actually won?