Assassinations diplomatic relations
He seems to be questioning past historical events and who the diplomatic relationships really benefits for. This seems to be connected to the next line. They killed Native Americans because they were different and to take over their land. Think about how those who are different are treated today.
If you look at the history of the OSS and CIA, the real American approach to foreign diplomacy has been to assassinate foreign leaders who do not play to our rules (even when they were democratically elected by their own people).
Also talking about the American habit of domestic political assassination — Lincoln, MLK, Malcolm X, JFK etc
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