Basically: In some countries, the pledge is with the constitution or the people, but in others (like constitutional monarchies), its a pledge to the (constitutional) monarch and their successors.
What is your opinion on this loyalty pledge? Do you believe it’s a reasonable request?
(For context: My mother and older brother had to do the pledge to gain [US] citizenship so the idea of deportation isn’t looming over our heads. I didn’t have do it because I was under 18 and my mother’s citizenship status automatically carried over to me according to the law.)
You said most countries but then only mention the USA. May I surmise you’re from the USA aka the world? :P
So I got curious, but it’s also 7am and I need to sleep. I looked it up for my own country: we don’t exactly have this
The Netherlands basically requires you to acknowledge that its laws apply to you (they do when you set foot here anyway) and that you’ll fulfill the duties that come with citizenship.
When opening the included FAQ item “what duties?” it says two things: you abide by the laws (duh) and that you should consider that you’re part of this society and that “you’ll do what is needed to really be part of this society.” Handwavey and not about choosing a side in a war or something, just focused on integration and community. Seems okay to me and distinct from blind allegiance. There’s some more details but the FAQs all circle back to respecting the other citizens (no discrimination) and the like
Source: https://www.rijksoverheid.nl/onderwerpen/nederlandse-nationaliteit/vraag-en-antwoord/verklaring-van-verbondenheid