Step 1: Understanding the Question:
The question asks about the origin of the Presidential system of government.
Step 2: Key Concept:
A Presidential system is a form of government where the head of government (President) is also the head of state and leads an executive branch that is separate from the legislative branch.
Step 3: Detailed Explanation:
The Presidential system of government first emerged in the United States of America.
The Constitution of the USA, adopted in 1787, established this system. It was designed with a clear separation of powers between the three branches of government: the legislative (Congress), the executive (President), and the judicial (Supreme Court).
This model was a distinct alternative to the parliamentary system that existed in Britain.
Step 4: Final Answer
The presidential form of government first emerged in America (the USA).