Nazis landed on American soil during WWII

 In 1942, 4 German soldiers landed in Amagansett, New York, and  4 in Ponte Verdra Beach, Florida, their mission was not to seize land, but to damage American infrastructure. Their targets were some of the crown jewels of America's industrial might: major hydroelectric plants, important aluminum factories, critical railroad tracks, bridges and canals–and the water supply system of New York City. But the mission failed when two of the conspirators instead attempted to defect, and sold out the rest of the team.

http://www.historynet.com/world-war-ii-german-saboteurs-invade-america-in-1942.htm