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For a good chunk of middle ages and the largest portion of modern era (IE 1453 to 80' of the XIXth century), Germany has been dominated by the HRE, a behemoth controlling basically all of central western Europe except for the southern part of Italy, what if, unlile OTL, someone managed to unite it durably, how does that affects effects such as tge colonizations, Crusades or the spread of Protestantism ?
N-B : Obviously it depends on when it unites.
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