a personal letter sent to Hitler
... that the United States severed diplomatic ties with Finland in 1944 because of a personal letter sent to Hitler?
... that the United States severed diplomatic ties with Finland in 1944 because of <b id="mwBXE"><a href="./Ryti–Ribbentrop_Agreement" id="mwBXI" rel="mw:WikiLink" title="Ryti–Ribbentrop Agreement">a personal letter sent to Hitler</a></b>?