None of them are really more powerful than any other they share the power and the all play a powerful role in our us government, to prevent any branch from becoming to powerful they would use a system called checks and balances.
The impact that is made in the events of 1970 and 1971 on the actions of Nixon in Vietnam is that his administration never made an iron-clad pledge based on the secured infringement of the Soviet <span> hegemony. Hope this answers your question. </span>
