Game of Thrones

[BmorePat87]

Basically time travel in GoTs means that everything has already happened. Bran was always destined to go back in the past and Warg young Hodor who was then going to be dumb the rest of his life and eventually help Bran.

Bran cannot change anything. Anything in the past that he impacts has already happened.

So if he is Bran the Builder, the wall was always built because he always went into the past to build the wall. There exists no universe where he hasn't impacted the past.