could hitler invated England or not? i need to know both sides.

The word "could" means "was possible" - so was it possible that Hitler could have invaded England? Of course it's possible - but he didn't.
http://www.google.com/search?q=britain+prevent+hitler+invasion&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA

=)