u/GodzillaPortal

The series takes place in a world where the Cold War turns hot, with a nuclear war ending the world. The survivors of Humanity build a Portal to a world based off the MLP universe, with the inhabitants only seeming to have Interwar era technology, while the humans bring their late Cold War equipment.

If you are interested in a GATE style scenario involving MLP and Cold War Americans, feel free to check it out!