Question

The origin of our three branches of government (the legislative, executive, and judicial) can be traced to

Answer 1

The correct answer is the fourth century B.C. 

The three branches of government (the legislative, executive, and judicial) originated in the 4th century B.C. when the philosopher, Aristotle, described the three agencies and powers the government holds. Since then, this model of government is prevalent and dominant throughout the world. 

Answer 2

The origin of our three branches of government (the legislative, executive, and judicial) can be traced to ancient Rome.
The republic was the name of the form of government in ancient Rome. Countries copied this form of government for centuries and the  government of the United States is based partly on Rome's model.