I can't remember who it was, but someone here said that instead of scrambling to keep panic completely balanced across the board, they surrender certain countries so that they have more breathing room and don't have to worry about constantly teetering on the edge of the abyss. It's only going to potentially affect your money in the endgame, and at that point money is mostly a non-issue.
Personally, I have too much gamer-OCD to intentionally "screw up" like that, but it seems like a really great way to manage panic levels.
I don't intentionally try to lose them but accepted before hand that I would accept any losses in order to get to mid-late game. My previous non-bugged try was so close, I had Titan armor and Plasma Rifles, but lost 1 too many nations.
The next one, I tried to balance things out while acknowledging that if there was a country to lose, I would prefer it to be in North America since the bonus isn't relevant. In the end it was only Mexico.
Africa has the most important bonus that helps out early on since money will be really tight. You really want to churn out those rifles and armors asap, and move supports to triple med-packs and revive. A lot of my initial guys were semi-retired by endgame because of low will, but they managed to train a new batch when they became colonels.
Once I had all or close to all countries, I'd have a Fighter or two equipped with Phoenix and then Laser guns, helped with dodge, aim, and the other bonuses until the upgraded alien tech fighters can be built. I never built more than 2 fighters per continent since Plasma was good enough to take down practically everything and I had backup satellites to deploy just in case.
Non-Titan armors are also unneeded to win since everyone had Titan+Chitin plating, except for Snipers who had scopes, and Supports who had Medpack+Chitin. Nanofibre vests are useful in the interim.
Once I got Titan+Plasmas, I moved onto the Alien base.
Essentially, just keep in mind that if you can see the enemy, they can see you so I just rush back if necessary and keep choke points. If there are multiple spawns, I simply don't hold back and rocket where necessary. Also keep in mind that the enemy will move into cover a take a shot on their turn if you don't move back far enough, so move with caution and set up traps. Where able move along the outer rim of the map and trigger external roaming units before converging on buildings and ships interiors.
Beserkers tend not to attack if they are overwatched in line of sight., and one of your guys can pin it in place while you take out its escorts. Sectopods don't attack a single target multiple times but can attack 3 targets that are in its line of sight, so only keep one in high cover to allow snipers to double-tap to death.
The only thing I have a real issue with on Classic Ironman are the bomb disposal missions early on. Terror missions aren't too bad either since I didn't fail any. Just keeping your squad up, alive should help save at least half for a 'Good' result.