explain the concept of regionalism. Explain the concept of multilateralism.

explain the concept of regionalism. Explain the concept of multilateralism.
Which concept has been utilized more world-wide and most importantly why? Use at least three resources other than the book to fully explain these two concepts in a minimum of 300 words.

Use APA or MLA format. Be sure to include a reference page. In-text citations will strengthen your paper

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