Throughout history, the borders of the world have changed many, many times. Solomon tells us that because of the transgressions of the land, it will have many rulers.
This video shows how the borders of Europe changed through the years from 1411 to 2012. We all know that land cannot transgress, but Proverb 28:2 speaks of the rulers and it's people of those lands who sinned. Thus their sins lead to many different rulers and owners of the land instead of a continuous ownership and control by the same people.