Answer:
Chaos.
Step-by-step explanation:
Checks and balances prevent power abuse from one person.
For example, the president can't act like a dictator because congress needs to approve before he declares war.
The Senate also serves a job to prevent other branches from abusing their powers.
The three branches are Legislative, Judicial, and Executive.
The possibility without them is pretty low but if a president decides to become the next Fidel Castro then they can't if there ischecks and balances. Similarily, without them Donald Trump might have become the next Stalin
I know I put some jokes in here but no offence please