America is the longest lasting form of this government *

Direct Democracy
Monarchy
Autocracy
Republic

The answer is a republic.

Direct democracy is where the majority people themselves decide on policies directly. America has a form of government that has a representative group of people who are elected by the majority, and they decide on policy.

A Monarchy is a form of governance where a single person is in charge of policy. Usually this person is born into the role of leader of their people. Think King and/ or queen.

An autocracy is a system of government in which an autocrat, a single person, or a party that possesses supreme power. this could be a dictator or a political party. This also could fall under monarchy, somebody who has been born into the position of ruling the government.

A republic is a state in which supreme power is held by the people and the people elect representatives.

America‘s form of governance is a constitutional federal republic.

I hope that helps.

I’m gunna say Republic too
I hope this helps :)))