But is it trivial to jam most ham frequencies across the 3.8 Million Sq. Miles of the U.S.? Or Europe (Same Size)? Or even just Germany (135,000 sq. miles)?

Edit: For comparison Egypt is about 387,000 sq miles.

I realize that you would not have to cover the entire country to be effective, but probably at least 90% of residential areas. Especially in Europe where the radio operators only need to reach over a nearby border.