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.

New projections from the UN Population Division show that population growth will be heavily concentrated in Africa and parts of Asia, while Europe, the Americas and Oceania face slowdowns or long-term declines.

These shifts will redefine economies, migration patterns, and geopolitical power in the decades ahead.

According to the latest forecast , Africa is set to become home to 4.6 billion people by 2100, more than tripling its current population. Asia, which today holds nearly 60% of the world’s people, is projected to decline slightly to around 3.8 billion.

Meanwhile, Europe is expected to shrink to 592 million, and Latin America to 380 million, reflecting ageing populations and persistently low birth rates. North America will grow modestly to 710 million, driven largely by migration, while Oceania is expected to reach 73 million.

These numbers arrive at a time when many nations are already struggling with demographic challenges. In 2025, countries from Japan to Italy are dealing with shrinking workforces and rising dependency ratios, prompting governments to rethink labour policies, immigration rules, and social welfare systems.

The UN has warned repeatedly that demographic imbalance is becoming a defining global issue, one that will influence economic growth, energy demand, and even climate strategy.UN Policy Brief: https://www.un.org/development/desa/pd/content/policy-briefs

Africa’s projected surge reflects both its young population and improvements in health outcomes. The continent currently has a median age of around 19, compared to 42 in Europe.

If managed well, this growth could provide a powerful economic engine, similar to the demographic boom that propelled China’s rise in the late 20th century. But the UN also cautions that without strong investments in education, infrastructure, and job creation, the rapid expansion could deepen inequality and strain public services.

Asia’s projected decline highlights a different challenge. China’s population has already started shrinking, and India is expected to stabilise mid-century before beginning its own decline.

Falling fertility rates, a trend seen across most of Asia , have raised concerns about future economic productivity. The Guardian recently reported that several Asian governments are offering financial incentives to encourage births, yet early results remain limited.

Meanwhile, Europe and parts of Latin America may face some of the world’s steepest demographic contractions. These regions are already experiencing school closures, labour shortages and increased reliance on migration to sustain their economies.

The IMF notes that countries with ageing populations could see slower GDP growth unless they adopt major policy reforms and attract foreign labour.

North America stands out for its relative demographic stability, largely due to immigration. The United States, in particular, continues to rely on migrants to expand its workforce, even amid political debates over border control. Current U.S. economic legislation and election-year discussions highlight how migration remains central to sustaining the country’s long-term population growth.

Oceania, while small in absolute numbers, is projected to continue growing but faces unique challenges tied to climate change. Rising sea levels threaten several Pacific Island nations, prompting discussions about potential displacement and migration corridors long before the end of the century.