In the United States, a candidate for president must be an American citizen who was born in the United States. This has created problems for some candidates in the past.
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The Montreal Protocol<span> on Substances that Deplete the Ozone Layer (a </span>protocol<span> to the Vienna Convention for the Protection of the Ozone Layer) is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion.</span>