How did alexander's attempt to make his empire secure lead to the hellenistic age?

This is my best guess according to the lesson i read:

Making the empire secure meant no invaders. This helped because if it would have been conquered Alexandria wouldn’t have been made and neither would other big roles in history.

Sorry if its incorrect, i tried lol

it refers to race, i am pretty sure this was a popular term in nazi germany or something.

a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

i hope this : )