500 b.C.
No body knows.
Slavery has been around as long as there have been humans.
Slavery has been around since the 1600's and is still going on.
1979
As long as cows have been in existence, or the whole Bos primigenius species and subspecies have been in existence.
The amazon rain forest has been in existence for at least 55 million years.
Helium is has been in existence since the beginning of the universe.
they have been in existence for 110 years since 1901.
long time
since 1992
October 1920
they have been here forever
about a year
The saxophone was patented in 1846.
1950
1909