Question

for cutting off our trade with all parts of the world for imposing taxes on us without our consent for depriving us in many cases of the benefits of trails by jury how is parallelism used here to strengthen the argument

Answer 1

In these lines, the author uses parallelism in order to strengthen the argument. The author lists all the complaints he has against the British government, and all the actions that he believes have been unfair and unjustified. In order to demonstrate this belief, he lists the items using the same structure in each one, which contributes to making the passage more rhythmic, more structure and more accessible, all of which make the passage more persuasive.

Answer 2

"For quartering large bodies of armed troops among us: 
For protecting them, by a mock Trial from punishment for any Murders which they should commit on the Inhabitants of these States: 
For cutting off our Trade with all parts of the world: 
For imposing Taxes on us without our Consent: 
For depriving us in many cases, of the benefit of Trial by Jury: 
For transporting us beyond Seas to be tried for pretended offences:"