The answer is simple, they both had the ability to nuclearly wipe out the other nation. This forced them to be on their toes at all times.
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Something that was not the best choice. It made made Panamians very upset, causing many tension to grow between the US and Panama.
From What I Know Fam........... Europeans didn't use maritime routes before the age of exploration because they feared that the Muslims controlling Portugal and Spain made maritime routes unsafe together with the fact that they didn't have the required ships and navigation skills to travel around Africa to Asia.
Well their are 7.62 billion people on the world. It would be 5%