What key concept does the Constitution introduce regarding the government?

The Constitution introduces the key concept of the separation of powers to ensure that no single branch of government becomes too powerful. This framework divides governmental authority among three branches: the legislative branch is responsible for making laws, the executive branch enforces laws, and the judicial branch interprets laws. This system not only creates a system of checks and balances but also fosters accountability, as each branch can monitor and limit the actions of the others. By distributing power in this way, the Constitution aims to protect individual freedoms and prevent tyranny, which is central to the democratic principles upon which the United States was founded.