re: If the entire world attacked the USA...

Let me get this straight. How is the attack coordinated?

Are they attacking from their respective home countries simultaneously?

Or is the attack more coordinated?

If the former, the USA has a chance to win if the world lacks resolve.

If the latter, I could see a scenario of two 1.5 billion + armies marching in from Mexico and in from Canada. That's right...Our neighbors would be our worst enemies. In that event, the USA gets creamed easily.

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I think the proximity to mexico would make it tough to protect the gulf oil rigs. They are well within missile distance. We could do it, but in this hypothetical I think our resources would be stretched thin trying to protect other fronts.

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Absolutely, our resources would be stretched thin but defending these assets are far easier than taking them all out. As for mexico, well, we have some B 52s that'd eb aching to carpet bomb any missile batteries and air based assets

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If the latter, I could see a scenario of two 1.5 billion + armies marching in from Mexico and in from Canada. That's right...Our neighbors would be our worst enemies. In that event, the USA gets creamed easily.

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Again...they have to actually GET to Mexico and Canada

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Absolutely, but I don't think it would be an easy task for the US to protect the energy sector to win this war either as some people are making it out to be. It would be interesting to see played out in some hypothetical simulator.

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FWIW I don't think it'd be easy. There would be catastrophic losses and the US would have to be balls to the walls the entire time and there would be assets lost. But it is not only feasible but IMO very possible it could be done.

I feel like it'd be a battle of attrition and for every pyrrhic victory the enemy won there would be several other failed missions. We talk about exhausting our forces but they'd be running pretty low after a while too. As would their resolve possibly

We need Darth Vader in here, he always has some good military insights

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In this hypothetical, the US would likely not attempt to go on the offensive and would simply be in "defend the homeland" mode. This allows the world as much time as they need to get the resources to get the people over there while the US was essentially force to hunker down and wait.

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We get a year too, though, and I doubt the US would sit by idly while millions upon millions of troops were landed on our borders

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I think a lot of you would be seriously disappointed in the effectiveness of a real life EMP,

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No not really.

But I wouldn't need them anyway. I think the OP imagined some strictly defensive preparations in the year-long lead-up. I'd send the bers all over the globe killing everything they see and destroying infrastructure and production.

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and how exactly are these billions of people getting here? and who the hell both has an army of 1.5 billion?

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Any boat the world can wrangle. Year to prepare, no worries getting there.

The entire world besides us.

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We get a year too, though, and I doubt the US would sit by idly while millions upon millions of troops were landed on our borders

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Then it technically wouldn't be a year to prepare if we went on the offensive before the year was up.

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We get a year too, though, and I doubt the US would sit by idly while millions upon millions of troops were landed on our borders

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Exactly. We'd blitz Mexico and force any land based assault through the bottleneck at Panama. What else they gonna do? Parachute in like Red Dawn? Those that survive our air force and ground to air attack would then face those 300 million+ privately owned firearms and the military.