Dissolution of Czechoslovakia
Since the federalization in 1968, Czechoslovakia had divided citizenship, either of the Czech Socialist Republic or of the Slovak Socialist Republic (the word 'Socialist' was dropped from both names shortly after the Velvet Revolution). This distinction, however, had little effect on the citizen's life. On January 1, 1993, all Czechoslovak citizens automatically became citizens either of the Czech Republic or the Slovak Republic, based on their previous citizenship, permanent residence address, birthplace, family ties, job, and other criteria. Additionally, people had one year's time to claim the other citizenship under certain conditions.
Czechoslovakism
Both Czech and Slovak states officially and somewhat proudly embrace the Czechoslovak heritage as part of their common history; in October 2018 there were celebrations of 100th anniversary of foundation of Czechoslovakia in Prague and Bratislava, and respective governmental agencies of both states joined forces in common enterprises like a grand Czech-Slovak Exhibition, organized by national museums. However, the Slovak 2018 celebrations focused on October 30, the day of the Martin declaration, while the Czech ones focused on October 28, the day the Czechoslovak National Council declared Czechoslovak independence. Moreover, October 28 is traditionally a major holiday in Czechia, while Slovak public holidays commemorate rather the Slovak constitution, establishment of Slovak state and the Slovak National Uprising.
The vision of common history as perceived by Czechs and Slovaks in 2018 is visibly, though not strikingly different; in opinion polls both nations quote somewhat different sets of most and least preferred personalities or episodes. Opinion polls as to the breakup of Czechoslovakia are inconclusive. In the late 2010s a slight majority of both Czechs and Slovaks approved of emergence of their own nation states, though only some 40% positively evaluated the breakup of Czechoslovakia; it seems that a slightly higher percentage of Slovaks than Czechs view the common past favorably. In 2018 Slovakia was the 4th Czech trading partner (6,3%), while Czechia was the Slovak 2nd partner (11,5%). There is an increasing number of Slovaks migrating to Czechia; currently it stands at around 110,000, which in percentage terms is more than in the interwar period and less than in the Communist Czechoslovakia. In terms of general sentiment both nations seem fairly close. In ratings of most-liked nations the Slovaks top the list in Czechia and the Czechs in Slovakia; in case they do not compete against each other, national sport teams (typically ice hockey) are mutually supported by Czechs and Slovaks. For many mid-age and older people a sentiment towards times of youth extends to Czechoslovakia-made icons like Krtek or kofola.