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

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. 

My opinion is that it doesn't