Login Restrict Records Global

Is there a way to build a stateless form and use that form to create a global variable or session in which i can restrict records.  I need a way for people to use this login form to view records but also restrict records I don't want them to see.
The standard User functionality only stores two variables (added_user & modified_user) .  Well i am the only one adding and modifying records so these filter don't do any good when you want to restrict records from people who did not create or modify them.
I have a table of users with the field username and state.  I have another table titled cities that has the state and city name.  I want the users to login using a stateless form, and then all records across the application that aren't in his/her state be restricted/hidden so that the user only sees the cities in his own state.  
I have the stateless form that sets a variable for that page and then I can use that variable in a filter but the issue is when that user navigates to another page the variable/session is lost.  
I need a global solution / session that will save the data and pass it from page to page. 
I have looked at this (below) page but it makes no sense to me at all.
https://kbase.creator.zoho.com/application/define-global-variables
Thank you for any help.
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