Can you explain this concept about the american government?

The American system of government was not based on divided power, it was based on LIMITED power.

Our Constitution is significant in history because, where other state charters existed to affirm the right of the state to define and assign powers, ours was specifically created to define what our government could NOT do infringe upon NATURAL rights.

The "checks & balances" system was put in place to ensure that no one function of government (the legislature's responsibility to the People...the executive's responsibility to the States and the judiciary's responsibility to the Law) became all-powerful via the reminder that each is ultimately responsible to (not empowered by) The Constitution.

It means that, instead of having a government where all the power is concentrated in one person - like a king - or one council - like a Cabinet - or one Department, the power is divided up and handed out to three main branches of government:
- the executive - which has the job of carrying out the laws
- the legislative, which has the job of making the laws, and
- the judiciary i.e. the courts, which has the job of solving individual disputes.

In reality, it does not work to limit the powers of government, because all of those different branches are all agents of the state, and have a conflict of interest as between themselves and the subjects of government.

Power corrupts.

Its far to corrupt. The good guys are persecuted and lied upon.