Answer:
The use of words such as "welfare" and "liberty" in the preamble show diction.
Step-by-step explanation:
Diction is defined as the choice of words and phrases in speech or writing. In other words, diction is simply word choice. They chose to use words like "welfare" and "liberty" in the preamble instead of other words that may have had a similar meaning. Diction can make things more or less formal depending on what words are used.