Slovakia

Great Moravia — the first Slavic empire

Great Moravia (833–907 CE) was the first major political state created by Slavic peoples — a kingdom centred in the Morava River valley (modern Slovakia and Moravia) that at its peak controlled the Carpathian basin, hosted the Cyrillo-Methodian mission, received papal recognition, and was destroyed by Magyar (Hungarian) invasion in 907, ending Slavic political dominance in the middle Danube for a millennium.

Cyril and Methodius — the apostles who gave Slavs their alphabet

Saints Cyril and Methodius (863 CE) — Byzantine missionaries sent to Great Moravia (centred on modern Slovakia and Moravia) — created the Glagolitic script to write Old Church Slavonic, the first written language for Slavic peoples, directly producing the Cyrillic alphabet (named for Cyril) that today is used by 250 million people across Russia, Bulgaria, Serbia, Ukraine, and beyond.

A thousand years of Hungarian rule — Slovakia as Upper Hungary

Slovakia (known as Upper Hungary or Felvidék) spent nearly a millennium (907–1918 CE) as part of the Kingdom of Hungary — the Slovak-speaking peasantry dominated by a Magyar-speaking nobility, the Slovak language surviving in villages and churches while the political, legal, and cultural life was conducted in Latin and later Hungarian, until the 19th-century national awakening created the idea of a Slovak nation.

Czechoslovakia — creation, occupation, and the Velvet Divorce

Czechoslovakia's creation (1918 CE), Nazi occupation (1938–1945), Communist takeover (1948), Prague Spring (1968), Velvet Revolution (1989), and peaceful dissolution into Czech and Slovak Republics (1 January 1993) compressed a century of European history into a single state — showing that a democracy could be destroyed from without and a dictatorship ended from within, all without catastrophic violence.

The Slovak National Uprising — resistance to the Nazi puppet state

The Slovak National Uprising (August–October 1944 CE) was the largest armed anti-Nazi resistance in Central Europe — 60,000 partisans and Slovak Army defectors held two central Slovak districts for two months against the Wehrmacht, while simultaneously the Slovak Jewish community was being deported and the uprising's leaders knew liberation from the east was coming too slowly.

The Velvet Divorce — how two nations parted peacefully

The dissolution of Czechoslovakia on 1 January 1993 CE — agreed entirely by negotiation between Prime Ministers Václav Klaus (Czech) and Vladimír Mečiar (Slovak), without a referendum, without violence, and without international arbitration — is one of the only peaceful dissolutions of a multi-ethnic state in modern history, producing the Czech Republic and Slovakia as separate EU member states.