It's an idiomatic expression. So you can't think of it in literal or grammarical terms.
cuz you will see them soon.
Some feel it is derived from Hebrew (sholom), German (so lange) or Arabic (salaam), but the first American usage of it is recorded in 1858
This article contents is post by this website user, EduQnA.com doesn't promise its accuracy.
More Questions & Answers...