<Li> Czechoslovakia, until the Czech Republic and the Slovak Republic separated in 1993 . </Li> <Li> The Federal Republic of Yugoslavia, from 1992 to 2003 when it became a confederation titled the State Union of Serbia and Montenegro . This confederation expired 2006 as Montenegro declared its independence . </Li> <Li> The 1960 Constitution of Cyprus was based on the same ideas, but the union of Greeks and Turks failed . </Li> <Li> United Republic of Tanzania (formerly United Republic of Tanganyika and Zanzibar), which was the union of Tanganyika and Zanzibar . </Li>

Explain what is meant by calling the united states a compound republic