To avoid plagiarism you must provide a citation for what - John Kennedy's birthday - Date of Berlin Wall destruction - UN Soviet Ruling - Comp Sci Statistics?

You should cite ALL of these things, but there is an argument to be made that JFK's birthday and the Date of the Berlin Wall's destruction are sufficiently well-known as to be in the public record and not necessary citations. You would definitely need to cite the latter two since these are particular issues that you can only have read in specific written materials.