Sometimes a very simple concept can have very vast significance and a far reaching impact.
The sefer Kol Hator says that Moshiach ben Dovid corresponds to Yishmael, while Moshiach ben Yosef corresponds to Edom.
If we take this a bit further, MBD corresponds to the Sefardic world, which made their home in the Arab lands. MBY corresponds to the Ashkenazic world, which made its home in the lands of Edom.
There are so many more things to say based on this.
For now, I'll let you all mull it over.
But I'll leave you with a question that might be explained in light of this idea (and remember that because reality is holographic, MBD is always contained in MBY and vice versa).
Why did WWI and WWII seem to have it's strongest immediate impact on the lands of Edom and the Ashkenazic world?