You have to get the idea that the US is a basically Protestant nation, that the Reformation was the source of its freedom, etc.--an idea common enough in the nineteenth century--acceptable in the twentieth, and not tainted by association with the Ku Klux Klan. (Even if this happened, perhaps Reformation Day https://en.wikipedia.org/wiki/Reformation_Day would be a more likely candidate than Luther's birthday--but perhaps it would popularly be known as Martin Luther Day anyway...)
Also, you have to get Luther accepted as a symbol of Protestantism even among non-Lutherans. To a great extent, of course, this has indeed happened. Witness a Black Baptist preacher from Georgia changing his name (and that of his oldest son) from Michael to Martin Luther in the 1930s... https://en.wikipedia.org/wiki/Martin_Luther_King_Sr.
(OK, I'll admit I got the idea from https://comb.io/dISuVd But I still mean it seriously.)
Also, you have to get Luther accepted as a symbol of Protestantism even among non-Lutherans. To a great extent, of course, this has indeed happened. Witness a Black Baptist preacher from Georgia changing his name (and that of his oldest son) from Michael to Martin Luther in the 1930s... https://en.wikipedia.org/wiki/Martin_Luther_King_Sr.
(OK, I'll admit I got the idea from https://comb.io/dISuVd But I still mean it seriously.)
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