Rome
A version of the republican government can be found in the Roman Empire.
Greece
Rome
Because it had a republican form of government prior to the civil war. The fundamental form of the US government has not changed since its formation 234 years ago.
a republican form of government.
Article IV, Section 4 of the US Constitution states:"The United States shall guarantee to every State in this Union a Republican Form of Government, . . . "Note that the words "Republican Form of Government" were capitalized in the US Constitution itself, making it crystal clear that a particular form of government is both mentioned in and guaranteed by the Constitution.
pure democracy
The United States federal government is a Republic, and the Constitution requires each state also have a Republican form of government. In a Republican form of government, the people elect people to represent them (senators and/or congressmen), who then vote on the law.
Protection from invasion (Article 4, section 4)
The government of Puerto Rico is a republican form of government with separation of powers, subject to the jurisdiction and sovereignty of the United States.
Bangladesh doesn't have any democratic or republican government like US does.
By allowing the public to elect representatives?