Which event is considered the origin of the modern state system?

Explanation

The Treaty of Westphalia in 1648 is generally recognized as the foundation of the modern state system. It introduced the concept of state sovereignty by ending the Thirty Years’ War and affirming the independence and territorial authority of states. While the Treaty of Versailles (1919) concluded World War I, it did not mark the beginning of the state system. Similarly, the end of World War II (1945) occurred much later, making it an unlikely starting point. Therefore, the option 'None of the above' is incorrect.