Since the founding of the united states, sentences used in presidential speeches have gradually

become much shorter
grown increasingly complex
started to include more old words
incorporated more latin words

there is no passage what do you mean?

give me the passage and i will answer your question

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."

whats the question you didnt post a question

explanation: