Why don't Americans learn French as a second language in school instead of Spanish?

Since French is so dominant in parts of Canada, they would be more competitive in the Canadian job market. I don't really see Americans wanting to compete for jobs in Mexico.
Update: @... : duh. But, Canadians and Americans often move to eachother's countries to find work. I have a cousin and a friend working in the States right now. I also know Americans who have moved up here for work.
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