What are the economic and political arguments for regional economic integration? Given these arguments, why don't we see more integration in the world economy?

Recently, we watched as "Brexit" occurred; this was the UK's withdrawal from the EU.Select a current global business event relating to Brexit from a news source, such aselectronic newspapers, New York Times, International Business Times, Economic Times, or CNN News.Please provide a summary of the article, relating it to the material you have read in chapters 1, 2, and 3. Include an explanation of what you learned in this article and if you agree with the author's perspective.