New Jersey became a state on December 18, 1787. So the 100th anniversary would have been December 18, 1878. The 200th anniversary was 1987.
December.18,1987
December 18, 1887
1976
California's centennial celebration was on September 9th, 1950.
It was on Saturday, March 6.
The Kansas state centennial celebration took place in 1961.
The centennial of Tennessee's statehood was in 1896.
It is called a "centennial celebration"
I am guessing you are referring to whether California had a centennial celebration. It was adopted into the union on September 9, 1850 making its centennial celebration that same day in 1950. There was a statewide celebration of that day. I do not know specifics about celebrations, but it was following the 1948 and 1949 celebration of the Gold Rush.
We used New Year's Eve to celebrate the year 2000
2056
In 1916
A 'centennial'
2056
A 100 year celebration is called a centennial celebration.