cant open up all fractions

[chemchok]

For starters, provincial and imperial campaigns have different descr_strat.txt files, so provincial campaigns can have different playable faction selections (if that was intended by the modders). Beyond that, there could be plenty of differences.

For example, the tutorial sons of mars campaign is setup as a provincial campaign - IIRC, there are only 4 factions in that campaign besides the Romans.

[steve]

so how do i play the provincial instead of imperial?

[chemchok]

so how do i play the provincial instead of imperial?

You still haven't said what mod you're using.

If you're using a faction unlocker mod, then the option to start a provincial campaign won't be there. If you had installed, say, RTR, the provincial campaign option would be present in the main menu.