They have no memory.
They killed all the natives and since then they have been talking non stop about the American Dream. Ask the Indians what they think of it. They had slaves here long after the Russians abolished slavery but they send their secretary of state around the globe to tell everybody how to behave. Watched the film "There will be blood"? I much prefered watching "Brideshead Revisited".
How can they understand and mediate the Midle-East conflict??
They behaved the exact same way toward their native population as the Israelis do now toward the Palestinians. Now it is Israel's Dream that has to be fulfilled at all cost. History repeats itself.