Czech Republic–Slovakia relations
Before 1918, both countries were part of Austria–Hungary. However, after the Ausgleich of 1867 Czechia belonged to the Austrian Empire while Slovakia belonged to the administratively separate Kingdom of Hungary, and between 1918 and December 31, 1992, both countries were part of Czechoslovakia. 
Both countries established diplomatic relations on January 1, 1993. These international relations are usually referred to or described as "very good", "cordial", and "above standard" in the media. When a Czech or Slovak president is inaugurated, very often his first international visit is to the former part of the common country. The same custom applies to newly elected prime ministers of the Czech Republic and Slovakia.
History of Slovakia
New signs of national and political life appeared only at the very end of the 19th century. Slovaks became aware that they needed to ally themselves with others in their struggle. One result of this awareness, the Congress of Oppressed Peoples of the Kingdom of Hungary, held in Budapest in 1895, alarmed the government. In their struggle Slovaks received a great deal of help from the Czechs. In 1896, the concept of Czecho-Slovak Mutuality was established in Prague to strengthen Czecho-Slovak cooperation and support the secession of Slovaks from the Kingdom of Hungary.