Or when someone invites you to a party and you take your whole squad of friends with you ...
During the times before German unification, there were several propositions about how tu unite Germany :
Kleindeutschland Lösung, what happend OTL, they left out Austria, and only kept German territories
Grossdeutschland Lösung, it was the main plan for quite a while, they were planning to keep czechs in the country, because they had close historical and cultural tides with them, and of course Austria, who would lead the country. The main problem was it meant for Hasburgs to loose all their non German possessions.
Grossösterreichische Lösung, the Hasburg suggestion, who were trying to keep all of their possessions under one crown. Meaning plenty of non germans from slovaks to croats would join the German federation, it was rejected.
BUT what would happen if through a hard and constant lobbying, some guys managed to make this proposal accepted.