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What factors made Austria adhere to "Diplomacy troughthrough marriage" doctrine?

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What factors made Austria adhere to "Diplomacy trough marriage" doctrine?

Bella gerant alii, tu felix Austria nube – ‘Let others wage war: thou, happy Austria, marry’.

Wikipedia doesn't say too much on the topic; but it's a frequently repeated historical anecdotal phrase.

What exactly was the origin of this foreign policy in Austria; and why was Austria special among other European powers (including other Hapsburgs) that they both tried and succeeded in it?