In the course of analyzing fascism, we noted that fascism avoids free market capitalism. This kind of laissez-faire economics is not compatible with the fascist's desire for control.
We also learned that fascist politics are dominated by militarism; instead of the political process directing the military, the military controls the political structure. In the words of the famous French leader during World War One, "war is too important to be left to the generals."
These two general principles can be applied to the United States. If we continue to allow our economy to function freely, without interference or regulation by the government, and if we make sure that our politicians direct the military, instead of the military directing the politicians, then we can avoid fascism.