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The United States is the most diverse country in the world. People from different parts of the world have migrated to the United States.Most Americans are hard working during the week days and look forward to weekend and they do all household jobs in the weekends like shopping, laundry, movies, visiting friends etc.As the USA is a large country and it is geographically disconnected from most of the world except Canada and Mexico,,to most Americans,the USA is the world.If something ,someone is the biggest ,best largest or richest in USA, they generally use the phrases like biggest in the world, or best in the world
Bio capacity is short hand for biological capacity which is the ability of an ecosystem m to produce useful biological materials and to absorb carbon dioxide emissions.Now most of other countries help each other in this respect.But because the USA is rich and Americans live within themselves, so other people think that Americans choose not to live like the countries living within their biocapacity
Please let me know if you need any clarification. I'm always happy to answer your questions.