The correct answer to this open question is the following.
The author use paragraphs 30-31 to refine their ideas in the following way.
When Thomas Jefferson, who drafted the Declaration of Independence, wrote <em>"In every stage of these Oppressions We have Petitioned for Redress..." </em>he wants to conclude that American colonists have tried many ways to get a proper answer from the British crown and the only answer they had received had been a repeated injury, which means, the King still considered aggressions to the colonists.
When Jefferson wrote <em>"...That these United Colonies are, and of Right ought to be Free and Independent States; that they are Absolved from all Allegiance to the British Crown, and that all political connection between them and the State of Great Britain, is and ought to be totally dissolved..." </em> he is making the strong conclusive statement that from now on, the colonies are declaring independence from the English crown so the colonies are free and independent states, that have the power and rights to do the things they freely consider correct.
You have not informed which Mark Twain story you are referring to, which makes it impossible to answer your question. However I can help you by showing what a simile is and what its effect is within a story.
A simile is a figure of speech that has the ability to compare two objects, beings or situations, which are very different from each other, but which have a certain similarity that allows this comparison to be made. In other words, we can say that the simile is a comparison of different but analogous elements.
Within a text, the simile is used to extend a meaning and better explain an argument, making the comparison so that the meaning of something is easily perceived and established.
An example of this can be seen in the following sentence, which was written by Mark Twain: "Dan'l give a heave, and hysted up his shoulders so like a Frenchman, but it wan's no use he couldn't budge; he was planted as solid as an anvil, and he couldn't no more stir than if he was anchored out."
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