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.
Martin Declaration
The declaration came two days after the declaration of Czechoslovak independence by the Czech National Committee in Prague. The Slovaks acted independently as news of the Czech declaration had not reached Martin by the time of the Slovak declaration. The council attempted to take control of Slovakia but was thwarted by a Hungarian military intervention which seized Martin on 15 November. Czech troops soon took the town and the new government in Prague appointed Vavro Šrobár as minister for Slovakia.