The first sentence are explaining how the colonists enduring pain and misery under the British rule, and how the founding fathers are trying to make a government where this cannot happen again. The next sentence is explaining more in depth of what life was like under the British empire's rule. The last sentence is about how they are claiming independence.
In 1980<span>, the American Psychiatric Association added PTSD to the third edition of its Diagnostic and Statistical Manual of Mental Disorders nosologic classification scheme. </span>
