The severe Sahel droughts beginning in the late 1960s pushed which desert southward?

A 1966 treaty entitled which nation bordering China to Soviet military help if invaded? A 1967 accident aboard the USS Forrestal, one of which kind of ship, caused a tragic fire? A 1967 Jimi Hendrix single was titled "The Wind Cries" whom? A 1967 law kept English as an official language in India until all states would accept which language? A 1968 Soviet film of which Russian novel was released in the U.S. in a shortened version of just over six hours? In which 1968 George Romero film do characters learn "kill the brain and you kill the ghoul"? A 1968 act of Congress said which holiday would be celebrated on the second Monday in October? In which 1968 horror film does the title character make it a family of three for the Woodhouses?