"They made Pettigrew their secret keeper." Tesla cringed as he heard the report from the M-Team he assigned to England at the request of his old friend whom he served with during World War II. Despite the closeness and mutual cooperation the American and British muggle governments shared, almost the exact opposite was the case on the magical side, often exacerbated by one Albus Dumbledore. The Brits still had their idiotic Statue of Secrecy, whereas the Americans would simply nether confirm nor deny the existence of magic. America was a magically rich and diverse county. In addition to the usual wizards, it was home to shamans, voduns, wiccans, druids, new-agers, technomages, mutants, and numerous others. Denying magic's existence would have been a waste of time, and enough people were magically aware that there was no point in already confirming what everyone already knew.
The official cover of the M-Team was they were a joint FBI/CIA liaison attached to the State Department and assigned to investigate American connections to the Irish Republican Army. This was a bit of a joke actually considering how many Irishmen were FBMI agents. At any rate, the M-Team was given Diplomatic credentials that would simply result in them getting expelled from the country if they were "caught" on the job. The British Ministry of Magic was still obligated to obey The Crown.
Tesla's first thought was to simply do everyone a favor and EMP Death Eater locations from orbit before sending in an MK-ULTRA hit team for mop-up. It was always better to ask forgiveness than permission, and after the usual apologies everyone would have forgotten about that old decommissioned satellite whose orbit decayed enough to put it in the gravity well. However, they were legally unable to act until receiving a preponderance of the evidence that the Death Eaters were targeting American Citizens, magical or muggle. After he lost three agents here, he was keeping his distance from America. The DMPA was ready to grant the Potter family asylum in America, but they continued to place their trust in that fool and his Order Of The Flaming Chicken.