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I think that is a more or less accurate summary. You've seized on one very important point which i would like to further emphasize, namely that it is easier in countries with a larger (non-European) immigrant population to build a working class bulwark against fascism and to radicalize workers toward realizing the necessity to overthrow capitalism altogether rather than just turn the dial back to more social democracy (which is not possible anyway due to the declining rates of profit, the contraction of empire, etc.). This is why fascists perceive immigrants, particularly those who do not "fit in" and will not or cannot be assimilated into the national identity and culture as especially threatening (as exemplified by even the most "liberal" Europeans' unhinged, borderline genocidal aversion to the Roma people).

In the case of the US there is a very interesting contradiction present because on the one hand it is the imperial capital and has settler colonial mentality deeply imprinted on its national identity, but at the same time there are possibly more groups that are rife for radicalization there than in any other part of the imperial core. From indigenous groups to the black and latin american minorities, the US is in the most real sense of the term a prisonhouse of nations. In addition to that the US has one of the least bribed and most exploited working classes compared to the rest of the imperial core. I see a lot of potential for building a revolutionary coalition. The two main obstacles to overcome are the pernicious liberal-individualist indoctrination and the settler national mythology, and these are both primarily ideological and not material factors.

New Zealand and Australia share some characteristics of the US as they are also settler colonies with all the internal contradictions that creates, but in other ways they are also very different and resemble more a country like France where there is an ongoing neoliberal slide but one that has not yet been fully completed.