After the formal unification of the Sandinista guerrillas in March, heavy fighting broke out all over the country.

Then, formal unification could proceed by popular referendum.

The formal unification occurred on Oct. 3, 1990.

After achieving formal unification in 1871, Bismarck devoted much of his attention to the cause of national unity under the ideology of Prussianism.

Adler had begun assembling the organization now known as the People's Revolutionary Front even before the formal unification of the two Germanies.

With formal unification taking place on Oct. 3, exact answers to such questions remain elusive.

It has been considered by observers that the FARC's advances as part of a 1996 to 1998 offensive eased the process of formal paramilitary unification.

The Belarusian leadership chose to build close relations with Russia, with the ultimate aim of formal unification.

Leaders in Bonn and East Berlin changed the date to speed up the formal unification of Germany.

Despite these moves, a formal unification would not take place until 2008.