How many stamps should I use if I'm sending a letter from Winnipeg, Canada to California?

Q: Well, I'm having a difficult time finding out how many stamps I should put on my letter to California. I'm not quite familliar of how many I should put. Does anyone know? xD !

A: I usually use double first class postage when I sent mail from Canada. The post office should be able to tell you. But, I have found that this did not work in Germany.

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