How to Create a Seperate collection in Seperate web page?

I am creating a DB for my website where people can enter their Name and Message . In my “www.mydomainname.com/USA” page the message is same as it is on the “www.mydomainname/Germany” page . When i add a Name and Message in “/Germany” page the message will be added on “/USA” and vice versa.
Should I have to create a separate collection and if i create it do i have to create the collection of every 190 countries ?.Please Help Me …!