Map of Europe in 1900

The British Empire comprised the dominions, colonies, protectorates, mandates, and other territories ruled or administered by the United Kingdom and its predecessor states. It began with the overseas possessions and trading posts established by England in the late 16th and early 17th centuries, and colonisation attempts by Scotland during the 17th century.

Mapped extent in 1900 CE: 27.34M km²

The Russian Empire was an empire that extended across northern Eurasia from 1721 until the proclamation of the Russian Republic in 1917, forming the final era of Tsarist Russia and the wider Russian monarchy. At its height in the late 19th century, it covered about 22,800,000 km2 (8,800,000 sq mi), roughly one-sixth of the world's landmass, making it the third-largest empire in history, behind only the British and Mongol empires.

Mapped extent in 1900 CE: 23.08M km²

The French Third Republic was the system of government adopted in France from 4 September 1870, when the Second French Empire collapsed during the Franco-Prussian War, until 10 July 1940, after the Fall of France during World War II led to the formation of the Vichy government. The French Third Republic was a parliamentary republic.

Mapped extent in 1900 CE: 5.82M km²

The Ottoman Empire, also known historically as Turkey or the Turkish Empire, was a state that spanned much of Southeastern Europe, West Asia, and North Africa from the 14th century to the early 20th century, centred in modern-day Turkey. It also controlled parts of southeastern Central Europe between the early 16th and early 18th centuries.

Mapped extent in 1900 CE: 2.17M km²

The Portuguese Empire was the first and longest lasting of the European colonial empires. Initiated during the Age of Discovery, at one point territories included parts of the Americas and Africa, along with ports and trading posts throughout Asia and Oceania.

Mapped extent in 1900 CE: 1.97M km²

The Kingdom of Portugal was a monarchy in the western Iberian Peninsula and the predecessor of the modern Portuguese Republic. Existing to various extents between the mid-12th century and the early 20th century, it was also known as the Kingdom of Portugal and the Algarves after 1471, and was the main constituent of the United Kingdom of Portugal, Brazil and the Algarves, which existed between 1815 and 1822.

Mapped extent in 1900 CE: 1.94M km²