Munchkinland was Highly Militarized

Look at this - it appears a significant portion of Munchkinland is in their goose-stepping army.
https://www.youtube.com/watch?v=XOEq-ImGWJ0&t=1m58s
And it's not just these troops, at various points in the parade you see even more soldiers in the background, in doorways, etc., and then the Mayor appears to have some type of elite Praetorian Guard near him, too. And then later, when the Lullaby League arrives, there are like twice as many troops that have seemingly materialized from nowhere.
So, we know that after the government of Oz collapsed, the Wicked Witch of the East seized control of Munchkinland and ran the place until Dorothy assassinated her, however, wouldn't the Munchkins have then retaliated against the Eastern Witch's collaborationist army as soon as she was dead? A lot of unanswered questions here.
https://www.youtube.com/watch?v=XOEq-ImGWJ0&t=1m58s
And it's not just these troops, at various points in the parade you see even more soldiers in the background, in doorways, etc., and then the Mayor appears to have some type of elite Praetorian Guard near him, too. And then later, when the Lullaby League arrives, there are like twice as many troops that have seemingly materialized from nowhere.
So, we know that after the government of Oz collapsed, the Wicked Witch of the East seized control of Munchkinland and ran the place until Dorothy assassinated her, however, wouldn't the Munchkins have then retaliated against the Eastern Witch's collaborationist army as soon as she was dead? A lot of unanswered questions here.