Europe was a massive battleground. The Posleen did poorly in extreme cold, not from the cold so much as an inability to forage, so both the Scandinavian peninsula and the Russian interior had been ignored. But Posleen forces had taken all of France and Germany except portions of Bavaria and swept around in an unstoppable tide to take all the North German plain to the edge of the Urals. There they had stopped more from distaste for the conditions than any military resistance.
At this point there was resistance throughout the Alps and down through the Balkans and Eastern Europe but the beleaguered survivors remained low on food, manufacturing resources and hope. The rest of Europe, all of the lowlands and the bulk of the historically “central” zones, were in Posleen hands.
America, through a combination of luck, terrain and strategic ruthlessness had managed to survive.
On both coasts there were plains which, except for specific cities, had been ceded to the Posleen. But the north-south mountain ranges on both sides of the continent, along with the Mississippi, had permitted the country to reconsolidate and even locally counterattack.
In the West the vast bulk of the Rockies protected the interior, preventing a link-up between the Posleen trapped in the narrow strip of land between the mountains and the sea. That narrow strip of land, however, had once contained a sizable percentage of the population of the U.S. and the effect of the dislocation and civilian loss there was tremendous. In the end most of the residents of California, Washington and Oregon made it to safe havens in the Rockies. Most of them found themselves in the still-building underground cities, the “Sub-Urbs” recommended by the Galactics. There they sat, working in underground factories to produce the materials the war needed and sending forth their hale to defend the lines.
There were many untapped sources of materials in the Rockies and all of them were being exploited, but what was missing was food production. Prior to the first landing all holds had been released on agricultural production and the American agricultural juggernaut had responded magnificently. But most of the spare food had ended up being sent to the few fortified cities on the plains. They were scheduled to hold out for five years and food was their overriding concern. So there was, elsewhere, a severe shortage when the first massive landing occurred. Almost all the productive farmlands in the west, with the exception of the Klamath Basin, had been captured by the Posleen. So most of the food for the Western Sub-Urbs had to be provided over a long, thin link across the Northern Plains following I-94 and the Santa Fe Railroad. Sever that link and eighty-five million people would slowly starve to death.
In the east it was much the same. The Appalachian line stretched from New York to Georgia and linked up with the Tennessee River to create an uncrossable barrier from the St. Lawrence to the Mississippi. The Appalachians, however, were nothing compared to the Rockies. Not only were they lower throughout, but they had passes that were nearly as open as flatland. Thus the Posleen found numerous places to assault all along the line. And the fighting at all of them, Roanoke, Rochester, Chattanooga and others, had been intense and bloody. In all the gaps regular formations, mixed with Galactic Armored Combat Suits and the elite Ten Thousand, battled day and night against seemingly unending waves of Posleen. But the lines held. They held at times only because the survivors of an assault were too tired to run, but they held. They bent from time to time but nowhere had they ever been fully sundered.
The importance of the Appalachian defenses could not be overstated. With the loss of the coastal plains, and much of the Great Plains, the sole remaining large areas for food production were Central Canada, the Cumberland plateau and the Ohio Valley. And although the Canadian plains were high quality grain production areas, their total production per acre was low and they were effectively unable to produce a range of products. In addition, while there was increasing industry throughout British Columbia and Quebec, the logistical problems of a broad-based economy in nearly sub-Arctic conditions that had always plagued Canada continued even in the face of the Posleen threat. It was impossible to shoehorn the entire surviving population of the U.S. into Canada and if they did the survivors would be no better off than the Indians huddling in the Gujarrat and Himalayas.
Lose the Cumberland and Ohio and that would be for all practical purposes the end of active defense. There would be humans left on the continent, but like all the other major continents, they would be shattered survivors digging for scraps in the ruins.