When the european union formed nations began to

When the EU formed, one of the major concerns was that the countries would not have as much control over who enters their territory - risking that some criminals they don't know about could enter.

Because of this, it was important that the countries cooperate on law enforcement: this made all the individual countries fees more secure.

It should be at the center of any map going vertically: the prime meridian, as it passes through greenwich,  england, is considered 0 degrees longitude