What does Jefferson mean when he writes “and to provide new Guards for their future security”?

When Thomas Jefferson wrote “ And to provide new guards for the future security”,  I think he was meaning that he wants to defend and protect.

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.