Why did Philip II need a navy to defeat the Greek city-states?

Philip II was interested in conquering the Greek city-states south of Macedonia because he wanted to conquer the Persian Empire, but in order to conquer such a large empire he needed the help of the Greek city-states.

why is a nation of the tood recurre.

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.