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French is one of the languages of the United Nations, so keep pursuing it. Language is an important skill if you would like to pursue international relations. Are you in high school? Look into schools with recognized international relations programs such as Tufts. Pursue internship opportunities while in college.
There are several government agencies with international aspects. The State Department is the most obvious choice, but you could also look into US AID, the Defense Department, Department of Commerce, as well as jobs interning in Congress.