What is the difference between malkhus (kingship) and memshalah (rule)? [This question adds meaning to three different lines in the siddur.]
… And so, we return to our original line from Ashrei: “מַֽלְכוּתְךָ֗ מַלְכ֥וּת כׇּל־עֹלָמִ֑ים, וּ֝מֶֽמְשַׁלְתְּךָ֗ בְּכׇל־דּ֥וֹר וָדֹֽר׃”
Malkhus is truly eternal. Memshalah will only last from generation to generation, through the course of history until its culmination. When all people will serve Hashem, will work together bring His Plan to reality.