I had a few questions about the meaning of "sich etwas (dative) anschließen". It seems that there is many similar, but distinct meanings of this word that I'm struggling to get a good feeling for. Let me give some examples:
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Ich sehe eine Gruppe Freunde. Ich werde sie fragen, ob ich mich ihnen anschließen darf.
I see a group of friends. I will ask them if I am allowed to join.
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Der Mann schloß sich der politischen Partei an.
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Der man schließt sich der Ideologie der Partei an.
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Ich schließe mich dir an.
(I agree with you?)
Now, example 1 would suggest that "sich anschließen" simply means "join". This is consistent with example 2. However, "join" does not work anymore for examples 3 and 4, and hence I suspect that this does not simply mean "to join".
Is there a fundamental difference in the use of the word when we are talking about organizations and ideas? Or is there actually some common theme between the uses in 1,2, and 3,4?