Why was it illegal to export silk worms from China

It was Illegal to exports silk worms from China because the Chinese wanted to keep a what on silk. Monopoly. Han emperors made Salt and Iron productions monopolies because they wanted to bring what to the Han dynasty and Kings? ... The Emperor.

Explanation:

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.

try something like republic or democracy joined or something because its talking about a election party.