As far as the difference in meaning between: Agree & Agree With… There is none. For, in order to “Agree” — it is necessary to do it “With” another person, idea, opinion, philosophy, etc.. (All of which would come from another person.)
When we use “Agree With” — there needs to be a Noun or Pronoun (acting as a Direct Object) directly after it in the sentence. This is usually a person, but can also be an: Idea, Opinion, Philosophy, etc..
To use the word “Agree” without the Direct Object, is usually as a statement in response to another, or in answer to a question — and the word “Agree” will almost always be the last word in the sentence… (but it can also be followed by an adverb, an adverb-phrase, or a phrasal-adverb.)
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