When did the following event happen?
Larry Page, Sergey Brin, and Scott Hassan begin work on what would become the Google Search Engine.
Select a space in the timeline below.
1981
Mauritania becomes the final nation to abolish slavery.
Note:
BCE means that the date is the number of years before the current era (CE/AD).
c. is short for 'circa' and indicates that the date is considered approximate.