Year of double-digit Epic
Rule. First two words express the number of the year of double-digit.
1963→63→6(6 letters) 3(3 letters)
Appear(6) boy(3),Osamu Tezuka's Tetsuwan Atomu (Astro Boy)animation.
People(6) use(3) a push-button telephone.
Treaty(6) end(3) of rivalry between France and West Germany, was the Élysée Treaty.
Speech (6) was(3) Martin Luther King, Jr.’s "I Have a Dream"
Treaty(6) was(3) the Partial Nuclear Test Ban Treaty.
Arrest(6) Ngo(3) Dinh Diem and assassinate him, South Vietnamese coup.
Misery(6) are(3) Miike coal mine explosion killing 458.
Misery(6) are(3) Tsurumi rail accident: A triple train disaster in Yokohama.
Murder(6) JFK(3).
If you try to make this, "number of letters" is on the Internet with the word "cross word".