The new war mechanics are making everyone burn through money faster than resources.
Roll back the 10% infra losses
Reduce military upkeep
Give us a commerce option that let's us maintain a positive income through a war, like Supermarkets generating a flat $1000 per turn instead of a % bonus. It would make them perfect for new nations trying to get going.
You could also add commerce options that do more than one thing and aren't useless during war, things like military upkeep reduction or loot protection. And merge the redundant ones...
Supermarkets: -2% commerce, +$1000 per turn, cap=5
Banks: +12% commerce, +5% loot protection, cap=8
Universities: +4% commerce, -10% improvement upkeep in host city, cap=3
Industrial Complex: -1% commerce, -20% military upkeep, cap=2
It's like a financial analyst gauntlet. xD