Is all literature politically charged?

No, although some literature is, such as Heart of Darkness by Joseph Conrad or Waiting for Godot by Samuel Beckett. These types of works were most popular in the late 19th century and early 20th century. But, there are other types of literature that are fueled by the writer's own life (i.e., Edgar Allan Poe who often wrote poems inspired by his late wife, Virginia Clemm, Sylvia Plath who wrote The Bell Jar based off of her own mental illness experience, and Everything, Everything by Nicola Yoon who wrote the novel based off of her daughter.) The most popular literature is based on what the author is most passionate about. Whether it is politics, activism, romanticism, etc., as long as it is charged by a driving force, it is literature. 

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Transition words are words like first, furthermore, besides, for instance, secondly, as a result using words like those should you write paragraphs showing time. you can start with first and then end with lastly or as a result