Why might knowledge of the compass have allowed the chinese to be the world's greatest sea power at one time?

They know how to navigate the seas. They would know how to get places quicker and more efficiently. Map making would also be better and more accurate.

if this is a true or false question its true

the answer is slaves

douglas was a slave who turned into a statesman and he refused to celebrate the 4th of july until all slaves were emancipated or set free.