If one branch was able to gain enough power, it could overrule the decisions made by the other two branches. The president could declare wars (though this has happened without the consent of Congress many times in the past), or Congress could enact legislation that would oppress the people.
https://www.enotes.com/homework-help/what-happens-one-branch-government-has-more-power-479907
What branch of government is most powerful?
Article II of the Constitution states that the executive branch, with the president as its head, has the power to enforce or carry out the laws of the nation.
https://www.history.com/.amp/topics/us-government/three-branches-of-government
Hope this helps!
