Questions & Answers about Cambiamos la ubicación.
Because cambiamos is the nosotros form of the verb cambiar, which is a regular -ar verb.
Pattern:
- yo cambio
- tú cambias
- él/ella cambia
- nosotros cambiamos
- vosotros cambiáis
- ellos cambian
So -amos tells you the subject is we.
A useful extra point: for regular -ar verbs, the nosotros form is the same in the present and the preterite:
- cambiamos = we change / we are changing
- cambiamos = we changed
You need context to know which one it is.