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.
List of ambassadors of the United States to the Czech Republic
In June 1992, the Slovak parliament voted to declare sovereignty and the Czech-Slovak federation dissolved peacefully on January 1, 1993. The United States recognized the Czech Republic and Slovakia as independent nations and moved to establish diplomatic relations. The previous ambassador to Czechoslovakia, Adrian A. Basora, continued as the ambassador to the Czech Republic and Theodore Russell, who served as deputy chief of mission under Ambassador Shirley Temple Black, became the first U.S. ambassador to Slovakia later that year.