Do you have any evidence of this besides your silliness about Obama dissing the queen? Because it's pretty clear that Obama continues to actively fight wars with the Europeans.
There is a clear shift in US policy away from Europe and towards other regions of the world. This is often reported. The US, under Obama, has also clearly stated that the future of the US is in Asia. European allies have consistently complained of being neglected.
There are relations with many Europeans, including the UK, but the relationships are becoming less important, less emphasized. Obama is not going to flip a switch and immediately change the state of US foreign relations. It's a gradual change.
This reminds me of when you were advocating that the US bomb London because of the their reaction to the Gulf oil spill. This is so far-fetched you might as well be talking about aliens from mars attacking US soil. It's also off-topic. This thread is about a potential conflict between Argentina and the UK, not about your fantasies of the US attacking Britain.
This reminds me of when you were advocating that the UK should be able to do whatever it wants in US territories, including destroying the livelihoods of millions of Americans, and in particular various minority groups.
My responses are on topic. I believe that the US would not necessarily side with the UK, just like when Obama agreed to the text of the OAS statement on the Malvinas.
The US needs to be on the side of the future rather than the past.
Perhaps the Malvinas can be transitioned to Argentina in a similar manner as Hong Kong was transferred to China. A peaceful transition planned well in advance may be the best solution. It would avoid any embarrassment for the UK.