What turning point in history led to the development of the European Feudal System?

The fall of the Roman Empire in the 5th century when Rome was sacked by the Visgoths led to the emergence of European Feudalism. Romans in Europe returned to their homeland leaving European lands without organisation and the system of Roman centralisation.

Explanation:

the correct answer is =   british soldiers attacked and killed five boston townspeople.

answer; /// i do believe that its napolean's conquest of spain;