What is the purpose of transitional words

Transition words and phrases are vital devices for essays, papers or other literary compositions. They improve the connections and transitions between sentences and paragraphs. 

So basically it makes it flow better.

Transition words are vital devices for essays, papers or other literary compositions. They improve the connections and transitions between sentences and paragraphs. They thus give the text a logical organization and structure

Explanation:

both the address and the poster use diction to convey their message. diction is defined as a style of writing or speaking based on the types of words chosen in order to send a message. parallelism is when a similar sentence structure is used for several sentences on a text; roosevelt's address doesn't follow that. repetition has to do with repeating a word or sentence in order to emphasize and idea, however neither the poster nor the address use repetion. finally, the address doesn't use images to convey a message.

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