>>96150176
Were that to happen, you'd probably end up with a scene where a crew of plucky peasants go into a museum, find an ancient era tank, and decide as a desperation move to use it, only to discover that the tank is way more powerful than the mechs being used in the invasion

>>95989067
Plus giant mecha have always been a thoroughly un-American concept. There's a reason the losers of WW2 are obsessed with mechs.