Heres a simple one based on limited knowlage of subject:

While there are many populer myths and legends in the world of pirates, there is a real factual history of this seafearing culture. Looking at there history, famos fugures, and developement into the modern age, we can have a better understanding of the real world of pirates.

ur thesis statement will be an answer to ur question

Example:

Q. According to the reliable histiry, what is the most important legacy left by pirates?

A. Uncontrolled pirating in the great oceans of the world have led to very strict international trading laws.

GL

The concept of Pirates throughout the old world has left a lasting impression on our society, the fame and notoriety that comes with the pirate life is shown through pirates that have become famous as a result of their actions, another idea to consider is that pirates varied in type and form, and surprisingly enough pirates are actually still prevalent through our modern society.

Then outline how miserable Priates were: prison, hangings, scurvy, loosing limbs, parrot poop on their sholders all the time…that sort of thing.

There should be greater enforcement of International laws against piracy.