Roman numerals: what is equivalent of cc?

Questions

In 1875 Walter---------- , founded a car company, born. ?

In 1908 Buddy---------- , actor (Beverly Hillbillies, Barnaby Jones), born. ?

In 1914 Sir Alec---------- , thespian (credits-too-numerous-to-mention), born. ?

In 1917 Pres. ---------- asked Congress to declare war against Germany. ?

In 1920 Jack---------- , actor (Dragnet, The D.I.), born. ?