I went through the mission where i took over gang territories and everything worked fine after that. I could kill and have gang wars. Now when i go by my house i dont even have a money sign anymore. Whenever i kill other gangs nothing happens either. No gang wars at all. If anyone else has this problem then help me out.

If you did the green sabre mission the gang wars are over for awhile at least. Thats the only thing I can think of.

how many different gang wars are there?
are there ones with each city?
I found it easy so if another gang is trying to take over a territory and you don't have the life or ammo to try and stop them just go save it and when you walk back out they aren't trying to take it anymore and then you can go on to your next territory.