How does Jefferson support his major premise on the body of the Declaration of Independence?

At first he mentioned The King's neglecting attitude towards the colonists. This excerpt from his speech directly shows the way Thomas Jefferson supports main premise: "Such has been the patient sufferance of these Colonies; and such is now the necessity which constrains them to alter their former Systems of Government. 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."