How does sharding work?

Ok, what happened:
I joined a friend with the Sparks of Life quest on his server (Sylvanas), my home server is Bloodfeather.
We did the quest, got an airdrop and I left the group. Ending up in Azure span with a new airdrop.
After that I flew to Valdrakken and to the world boss in the Waking Shores.
In the Waking Shore the whole zone was full of German Alliance. Servers Thrall, Antonidas, etc. Even the starting zone was full of level 60 German Alliance players.

How? Why?

A shard is a collection of players from various servers. Some servers have too few players and the world feels empty. Some servers have a lot of players and this can cause lag or issues with tagging mobs or looting quest items.
So they take some of the players from the overly full server and combine them with those from the almost empty server.
Load Balancing of a sort.

When you join a group you are put into the same shard as the group leader. If you are in Warmode and they aren’t then you won’t see each other as you as in different Phases (these are similar to Shards).
When you leave the group you will be put back to your original Shard. If you change Group Leader you often change Shard. This used to be used to jump shards to kill the same Rare over and over but I think this no longer works.

That doesn’t answer the question why I am the only Horde player in a shard full of German alliance.

I don’t think the algorithms used to combine the players is made public.
I don’t think there was some master-plan to force you into fighting dozens of Germans though. Luck of the draw I would suspect.

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