Question

why did napoleon design a blockade in 1806?
to cripple the economy of england
to force england to accept french authority
to prove that france could destroy england
to force england to give up supremacy at sea

Explanation:

Napoleon designed the Continental System (blockade) in 1806 mainly to cripple Britain's economy. By preventing British goods from reaching the European continent, he hoped to weaken Britain economically. This was a key aspect of his strategy against Britain as he couldn't directly defeat it at sea.

Answer:

to cripple the economy of England