What is easier?

What is less difficult?
To invade from USA to Europe or invade to USA from Europe?

I would like to hear your opinions and explanations.

Hard question. Europe>North america. But If it was FFA (asia) can pressure europe.If asia still in war, europe has a chance, to take north america. BUt if a united asia extended from japan to at least India. North AMerica will a great starting place.

Europe is stronger.You may not believe it but:

1.Better income
2.More units.

USA is much easier to invade. The USA consists of only 8 territories, you can stop all USA reinforcements by taking 8 cities. While Europe consists of 7 large countries, and many smaller countries, making it much harder to invade.

Stronghold europe.

Europe is easier to invade, since it's way harder to defend when your reinforcements are split in many capitals. Now, if we are talking about fully conquest of the continent, I have no doubt it would be harder to control europe, as the player holding it can recover faster from an attack.