The snail was introduced to earth in the Late Cambrien period.
I think Harmony Day was introduced to Australia in 1998
never
1954
2006
The government
The Phoenicians
1997
some time after the ancients XD
Veterans day was first introduced as Armistice Day after WWI. Originally meant to commemorate the end of the war, it now concerns American veterans, specifically living ones.
On... Earth Day.
It should be --- Earth Day, Planet Earth.