Well mostly from a combination of internal instability, and Western interference. See if you are upset about the local dictator abusing his power and having his “police”/intelligence service harass you every time you speak out against him, then if you learn that he's supported by some foreign power some of your feeling of frustration, aggression and hatred is going to be redirected onto that foreign power. As it happens, that power is often the USA and (less visibly) the EU.
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