Question

when the european union formed, nations began to
create one unified education system.
eliminate their home governments.
cooperate on law enforcement.
abolish many geographic boundaries

Explanation:

The European Union (EU) is a political and economic union of European countries. One of its key aspects is cooperation among member states. While education systems remain largely national (not unified across the EU), member - states do not eliminate their home governments. Geographic boundaries are still in place in a territorial sense. However, in the area of law enforcement, EU member states cooperate. For example, there are EU - wide initiatives for police cooperation (like Europol) and cooperation in criminal justice matters.

Answer:

cooperate on law enforcement.