Tas: Halacha dictates a mishibrrech should be said for the state.
משנה ב רַבִּי חֲנִינָא סְגַן הַכֹּהֲנִים אוֹמֵר הֱוֵי מִתְפַּלֵּל בִשְׁלוֹמָהּ שֶׁל מַלְכוּת שֶׁאִלְמָלֵא מוֹרָאָהּ אִישׁ אֶת רֵעֵהוּ חַיִּים בְּלָעוֹ
I know…I know….the mishna is outdated and our gedolim know better.
One of the reasons we stopped was because in ww1 Jews were fighting each other. However, if you look in older day siddurim, they still have it for the queen or czar.