it was a landmark decision in which the Supreme Court of the United States held that the power to regulate interstate commerce, granted to Congress by the Commerce Clause of the United States Constitution, encompassed the power to regulate navigation Hope this helps !!!
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I would say that the deciding factor was that he made the "right" alliances - for example he was on friendly terms with Nazi Germany, which saved Spain from being invaded by Nazi Germany and also within Spain, he made some associations with some groups that helped him maintain his power.
