Those are called checks and balances, and are there to make sure power is distributed. It’s good that you need buy in from lots of different people.
Not quite. They are designed so that any genuine threat to Capitalist profits can be stalled out.
You don’t want to make a system where a few people can go drastically against the will of most people.
That’s what America already is and has been since its inception.
So you’d first need to build wide support across the majority of the country or state. That’s the whole point of democracy.
America is not a functional democracy, and needs to be overthrown and replaced with a functional democracy. The State needs to be entirely smashed and a new one built on top of the ashes.