While I agree with your point about self-sustainability, the US now produces almost as much energy as it uses. From the world bank (http://data.worldbank.org/indicator/EG.IMP.CONS.ZS) these are 2013 figures percent of energy use imported:

    Denmark      4
    France      46
    Germany     62
    Italy       77
    Netherlands 10
    Spain       71
    Sweden      29
    Japan       94
    Korea       83

    US          15
    Canada     -73
    Mexico     -19