You need to change the scripts so they affect <Local Player> instead
Some advice to avoid mismatches and add safeguards to cheating - you need to make 8 instances of the script, each one of which has 2 extra conditions as well the check for the Barracks, so your 8 scripts will look like this;-
*** IF ***
Player <Local Player> Is Side : America
*** AND ***
AmericaBarracks has been built by Player <Local Player>
*** AND ***
Player <Local Player> Starting Point is N
*** THEN ***
The world is revealed permanently for Player <Local Player>
Substitute 'N' for the numbers 1 - 8 and then put all 8 scripts into one folder inside the PlyrCivilian folder.