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The secret to understanding US foreign policy is that there is no secret. Principally, one must come to the realization that the United States strives to dominate the world. Once one understands that, much of the apparent confusion, contradiction, and ambiguity surrounding Washington's policies fades away. To express this striving for dominance numerically, one can consider that since the end of World War Two the United States has:
1. Endeavored to overthrow more than 50 foreign governments, most of which were democratically-elected.
2. Grossly interfered in democratic elections in at least 30 countries.
3. Waged war/military action, either directly or in conjunction with a proxy army, in some 30 countries.
4. Attempted to assassinate more than 50 foreign leaders.
5. Dropped bombs on the people of some 30 countries.
6. Suppressed dozens of populist/nationalist movements in every corner of the world.
The United States institutional war machine has long been, and remains, on automatic pilot.
Chomsky, and other, of course, offer the same analysis. This synopsis is worth memorizing.