[The Great RJ]

Sad to say but an invading German army might have suceeded in capturing many eastern seaboard cities in 1900. Only a few years earlier there was serious concern that the Spanish fleet in Cuba might have shelled US cities on the east and Gulf coasts. US military strength at the time was quite low and the Navy had not yet started a serious build up in capital ships.

However, a German invasion may well have met with serious guerilla warfare as its army attempted to move inland.

[Cleburne]

We seem to have been terribly worried, and took a number of precautions. The Gulf Coast barrier islands are dotted with the ruins of old concrete forts and gun emplacements, built around the trun of the century for fear of attack. The area around Pensacola, FL, is especially dense in forts and batteries. But then airplanes and submarines got better, and the whole coastal fort idea became largely obsolete.