it collapsed
Many things happened to the European Empire and what truly happened was that it was near a collapse.
My Empire happened in 2010.
Zoo Empire happened in 2004.
Casino Empire happened in 2002.
The Empire of Karn happened in 1985.
Empire - PLATO - happened in 1973.
Titan Empire happened in 1983.
Steel Empire happened in 1992.
Restaurant Empire happened in 2003.
Lost Empire happened in 2007.
Jade Empire happened in 360.
Ashes of Empire happened in 1992.