The power in the tree branches of government is limited by

According to the doctrine of separation of powers, the U.S. Constitution distributed the power of the federal government among these three branches, and built a system of checks and balances to ensure that no one branch could become too powerful. eh..i hope i helped <3 btw im rlly sorry if it didn't help.

the us constitution is a living document, meaning that it can be changed over time as the country changes.