Which major mathematical publishing merger created the company that now publishes both the prestigious 'Journal of the American Mathematical Society' and 'Mathematische Annalen'?

The mathematical publishing industry has seen significant consolidation over the decades, with several major mergers reshaping how educational and research materials reach mathematicians, students, and educators. This trivia question explores one of the most significant brand mergers in mathematical publishing history that created a dominant force in STEM academic resources.

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Springer and Nature Publishing Group (creating Springer Nature)
Pearson and Macmillan Mathematics
Elsevier and Wiley Mathematics Division
McGraw-Hill and Cambridge University Mathematics Press