Let's look at the "worst" president and mismanagement claims.Link
FDR led us into World War II. Germany never attacked us: Japan did. From 1941-1945, 450,000 lives were lost, an average of 112,500 per year.
Germany declared war on us shortly after Japan attacked Pearl Harbor.
As for direct attacks, on 31 October 1941 a German sub attacked and sank the Reuben James in the North Atlantic. You can look it up. There's even a song.