The above map of Italy in 1850, before unification, captures a moment when political fragmentation defined everyday life; from laws and currencies to armies and identities.

In the mid-19th century, Italy did not exist as a single state. The Kingdom of Sardinia, centred on Turin and ruled by the House of Savoy, controlled much of the northwest and would later lead the unification movement. To the northeast, Lombardy–Venetia was under Austrian rule, reflecting the strong influence of the Habsburg Empire in Italian affairs.

Central Italy was dominated by the Papal States, governed directly by the Catholic Church from Rome, while Tuscany, Parma, and Modena functioned as independent duchies. In the south, the powerful Kingdom of the Two Sicilies, with Naples as its capital, ruled over southern Italy and Sicily.

After the Congress of Vienna in 1815 , European powers deliberately restored and reinforced small states to prevent the rise of strong nationalist movements. According to Britannica , this system preserved foreign influence, particularly Austrian control, while suppressing liberal and nationalist ambitions across the peninsula.

Yet by 1850, pressure for change was growing. Economic disparities, censorship, and foreign domination fueled resentment, especially among intellectuals and the emerging middle class. Secret societies, revolutionary groups, and figures such as Giuseppe Mazzini promoted the idea of a single Italian nation bound by shared language and culture.

The map also highlights the strategic importance of Rome, which remained outside the future Kingdom of Italy until 1870 due to papal protection by French troops. Its eventual annexation completed unification, making Rome the capital and ending centuries of papal territorial rule.

Italy’s unification between 1861 and 1870 transformed Europe’s political balance, creating a new nation-state at a time when nationalism was reshaping the continent.

A produced by The World in Maps categorises these nations by their official or constitutionally endorsed faiths — Christianity (in red), Islam (in green), and Buddhism (in dark grey) — pointing to the enduring complexity of how states and religions interact globally.

What a “state religion” means and how it varies

A state religion (also called an official or established religion) is one that a government formally endorses or gives special status, privileges, or constitutional recognition. But this does not necessarily mean the state is a theocracy or that it compels all citizens to follow that faith.

In many nations, religious freedom still exists, albeit within a framework where the “official” religion enjoys preferential treatment , whether in funding, influence over ceremonial functions, or constitutional prominence.

This landscape is diverse in practice. Some states explicitly define their religion in their constitutions, others make public references, or provide institutional support.

For instance, Jordan’s constitution states that “Islam is the religion of the State” while still permitting other faiths to be practised.

Malaysia’s federal constitution similarly affirms Islam as the religion of the federation, though it allows other religions to be practised peacefully.

Where state religions persist, and which ones

The map shows a concentration of state religions in parts of the Middle East, Southeast Asia , and parts of Europe and Africa.

Islamic state religions are particularly frequent: countries like Saudi Arabia, Malaysia, Jordan, Kuwait, and others have Islam as the constitutionally recognised religion.

In the sphere of Buddhism, a few nations (such as Bhutan and Cambodia) declare Buddhist identity in their constitutions as a “spiritual heritage” or state faith.

In Europe, some countries maintain established Christian churches (e.g. the Church of Denmark), though the practical role of these churches varies, and secularisation trends are strong.

It’s also worth noting that many more countries, beyond those with formal state religions, still favour one religion through policy, funding or cultural entanglement. According to Pew , over 80 nations give official or unofficial advantages to particular faiths.