What wrong did the colonists accuse king george iii of in the declaration of independence?

"The history of the present King of Great Britain is a history of repeated injuries and usurpations, all having in direct object the establishment of an absolute Tyranny over these States" I pretty much need to evaluate the accusation made against George III, but I don't understand what is being said and what he is being accused of doing.

Explanation:

Mayan cities got overcrowded because of steady water supply  and limits of the region's agricultural capacity.