If you made a list of all the US territories Japan attacked in WWII, I bet Kansas wouldn't be on it, but it should:

The year was 1945 and the United States was in the middle of World War II. Omaha seemed relatively safe until one night in April when a Japanese bomb dropped in Dundee.

I'd known about the balloon bombs for quite some time, but I had no idea one had made it as far as Kansas. Air & Space magazine did an article on them a few years back... they built hundreds of them. What the Japanese didn't seem to count on was that US population densities and distributions weren't anything like Japan's or China's. Once you got past the West coast, the US (especially in 1945) was a whole lot of empty. The vast majority of balloons that actually made it ended up attacking various forests and corn fields.

Of course, that was cold comfort to the few poor bastards who ended up underneath one at the wrong time.