In general, Easter is a christian holiday, so any country with Christianity in it, might celebrate it. It isn't just an American holiday, although egg hunting and eating candies may be only an American tradition.
contrapositive
With chocolate Easter eggs
I will be working for the kingdom of God not celebrating Easter or the bunny
So about 310 AD I would say Easter was being celebrated throughout Rome and Europe.
we are celebrating the rising of jesus and that he died for all of us to live
The time for celebrating the Sacraments of Initiation is Easter.
A bank holiday isn't celebrating Easter and and Easter holiday is.
I guess because they are related....Christmas is celebrating the birth of Jesus and Easter is celebrating the death and resurection (coming back to life) of Jesus.
Celebrating The Easter Bunny
They are celebrating their independance from the British.
There are two: Christmas, celebrating the birth of our Savior, and Easter, celebrating the death and resurrection of Jesus which saved us from our sins.
Because people like festivals and holidays and people don't generally care why they are celebrating, or what they are celebrating and it's easier to keep people in the seats at church if you give them something they like. It's the whole reason why Easter and Christmas started in the first place.