Hello - I am living in NZ (many many years ) - but i want to download an app to use with history.com.

Ive found out that my IPAD (latest ios), cannot locate/find the "history vault". Im not sure what i did, but i managed to locate it on the ipad US store.

i can/could (if i remember what i did) switch to the US store, and find the app. However, in order to get the app, i need to switch back to the NZ store to get it.. but of course, i cant get it in NZ.

Is there a way that i can permanently switch to US store - without deleting / erasing my existing apps / changing the IPAD. Will it affect anything ?

If i do switch to USA, & manage to download / get the "history vault", can i switch back to NZ store & still keep the new app ?

- can someone provide instructions on switching stores. thank you....

 EDIT: Of course - can this be done legally :)