Some cartoons use US voice artists while others use Canadian voice artists. But there were some cartoons that used a mixture of both.
Zatch Bell
Mucha Lucha
Tripping the Rift
What's With Andy?
The Magic School Bus had Lily Tomlin and many US celebrity voices while the child cast was Canadian.
Coconut Fred's Fruit Salad Island. (Rob Paulsen was a US voice artist while the rest was Canadian.)