Misc
4 Historical Maps that Explain the USSR
The eyes of the world are now fixed on the Russian invasion of Ukraine.
The motivations of Russia’s president, Vladimir Putin, are now the biggest unanswered question of this geopolitical event. One prominent line of thinking is that Putin is looking to reclaim the territory lost after the dissolution of the Union of Soviet Socialist Republics (USSR), and the Russian leader’s own words appear to support this claim:
Ukraine is not just a neighboring country for us. It is an inalienable part of our own history, culture and spiritual space. Since time immemorial, the people living in the south-west of what has historically been Russian land have called themselves Russians.
The disintegration of our united country was brought about by the historic, strategic mistakes on the part of Bolshevik and Soviet leaders […] the collapse of the historical Russia known as the USSR is on their conscience.
For anyone born after the 1970s, memories of that era range from hazy to non-existent, so it’s worth answering the question: What was the USSR anyway?
Below, we’ll use historical maps from three specific eras to build context for how the USSR was structured, which modern countries were a part of this sprawling country, and how its history relates to Russia’s present day pushes for territorial expansion.
Let’s dive in.
The Early Days of the Soviet Union
The USSR was first born in 1922, in the aftermath of the fallen Russian Empire. A civil war between the Bolshevik Red Army and anti-Bolshevik forces across the region ended with the former coming out victorious. This resulted in the unification of a number of republics to form the Soviet Union.
After a number of tumultuous years during the reign of Joseph Stalin, which include a devastating famine which killed millions of people, we arrive at our first snapshot in time: the late 1930s.

For more detail, view the full-sized version of this map
The USSR was set up as a federation of constituent union republics, which were either unitary states, such as Ukraine, or federations, such as Russia.
Below, we can see how this organizational structure was laid out.

For more detail, view the full-sized version of this diagram
While nominally a union of equals, in practice the Soviet Union was dominated by the Russian Republic (RSFSR). This massive republic contained most of the country’s economic and political power, as well as the largest population and landmass.

For more detail, view the full-sized version of this map
The geopolitical history of the USSR is inexorably bound with territorial disputes with neighboring regions. In the map above, from 1938, we can see that Soviet troops are clashing with Japan on the eastern edge of the country. On the other end, Stalin had annexed half of Poland, the three Baltic States, and portions of Romania, following the pact with Adolf Hitler.
This sequence of events set the stage for World War II.
The Soviet Empire
The USSR achieved victory in WWII, but at a great cost. An estimated 14% of the prewar population perished in the conflict.
By the end of the 1950s though, the Soviet Union was riding high on a string of impressive achievements on the world stage, from launching the first satellite into space to developing missiles that were a credible threat to American cities. As well, the country’s GDP growth was outpacing its Cold War rival.
This map is a snapshot of the USSR just prior to the construction of the Berlin Wall in 1962.

For more detail, view the full-sized version of this map
Above, in orange, we see how much territory the USSR ended up with after the war. This map is especially informative as it lists the populations of the territories at the time. Large portions of Eastern Europe—including more than 22 million people—were rolled behind the iron curtain.
The Waning Days of the USSR
After a prolonged period of stagnation, Mikhail Gorbachev attempted to reform the Soviet political and economic system with perestroika, which literally translates to “reconstruction”. This movement began a slow process of democratization that eventually destabilized Communist control through the late 1980s, hastening the collapse of the Soviet Union.
The map below is a snapshot of the USSR two years prior to its official dissolution in 1991.

For more detail, view the full-sized version of this map
Many of the republics, shown in various colors above, were already seeing independence movements and unrest by this time, and would eventually declare independence one by one.
Here’s a list of the major regions that seceded from the USSR:
USSR Subdivision | Present Day Country | Seceded from the USSR |
---|---|---|
Estonian SSR | 🇪🇪 Estonia | 8 May 1990 |
Lithuanian SSR | 🇱🇹 Lithuania | 11 March 1990 |
Latvian SSR | 🇱🇻 Latvia | 4 May 1990 |
Azerbaijan SSR | 🇦🇿 Azerbaijan | 30 August 1991 |
Georgian SSR | 🇬🇪 Georgia | 9 April 1991 |
Russian SFSR | 🇷🇺 Russian Federation | 12 December 1991 |
Uzbek SSR | 🇺🇿 Uzbekistan | 31 August 1991 |
Moldavian SSR | 🇲🇩 Moldova | 27 August 1991 |
Ukrainian SSR | 🇺🇦 Ukraine | 24 August 1991 |
Byelorussian SSR | 🇧🇾 Belarus | 10 December 1991 |
Turkmen SSR | 🇹🇲 Turkmenistan | 27 October 1991 |
Armenian SSR | 🇦🇲 Armenia | 21 September 1991 |
Tajik SSR | 🇹🇯 Tajikistan | 9 September 1991 |
Kazakh SSR | 🇰🇿 Kazakhstan | 16 December 1991 |
Kirghiz SSR | 🇰🇬 Kyrgyzstan | 31 August 1991 |
Since these regions seceded with their borders largely intact, a current map of this part of the world doesn’t look too different from the one above.
That said, even as borders remain static, the war in Ukraine demonstrates that power dynamics in this region are still very much in flux.
Maps
Mapped: What Did the World Look Like in the Last Ice Age?
A map of the Earth 20,000 years ago, at the peak of the last ice age, when colder temperatures transformed the planet we know so well.

What Did the World Look Like in the Last Ice Age?
What did the world look like during the last ice age? Was it all endless glaciers and frozen ice? The answer is a partial yes—with some interesting caveats.
The Last Glacial Maximum (LGM), colloquially called the last ice age, was a period in Earth’s history that occurred roughly 26,000 to 19,000 years ago.
This map by cartographer Perrin Remonté offers a snapshot of the Earth from that time, using data of past sea levels and glaciers from research published in 2009, 2014, and 2021, alongside modern-day topographical data.
Let’s dive into the differences between the two Earths below.
The Last Ice Age: Low Seas, Exposed Landmasses
During an ice age, sea levels fall as ocean water that evaporates is stored on land on a large scale (ice sheets, ice caps, glaciers) instead of returning to the ocean.
Earth's Ice Cover | 20,000 Years Ago | Today |
---|---|---|
Surface | 8% | 3% |
Land | 25% | 11% |
At the time of the LGM, the climate was cold and dry with temperatures that were 6 °C (11 °F) lower on average. Water levels in the ocean were more than 400 feet below what they are now, exposing large areas of the continental shelf.
In the map above, these areas are represented as the gray, dry land most noticeable in a few big patches in Southeast Asia and between Russia and Alaska. Here are a few examples of regions of dry land from 20,000 years ago that are now under water:
- A “lost continent” called Sundaland, a southeastern extension of Asia which forms the island regions of Indonesia today. Some scholars see a connection with this location and the mythical site of Atlantis, though there are many other theories.
- The Bering land bridge, now a strait, connecting Asia and North America. It is central to the theory explaining how ancient humans crossed between the two continents.
- Another land bridge connected the island of Great Britain with the rest of continental Europe. The island of Ireland is in turn connected to Great Britain by a giant ice sheet.
- In Japan, the low water level made the Sea of Japan a lake, and a land bridge connected the region to the Asian mainland. The Yellow Sea—famous as a modern-day fishing location—was completely dry.
The cold temperatures also caused the polar parts of continents to be covered by massive ice sheets, with glaciers forming in mountainous areas.
Flora and Fauna in the Last Ice Age
The dry climate during the last ice age brought about the expansion of deserts and the disappearance of rivers, but some areas saw increased precipitation from falling temperatures.
Most of Canada and Northern Europe was covered with large ice sheets. The U.S. was a mix of ice sheets, alpine deserts, snow forests, semi-arid scrubland and temperate grasslands. Areas that are deserts today—like the Mojave—were filled with lakes. The Great Salt Lake in Utah is a remnant from this time.
Africa had a mix of grasslands in its southern half and deserts in the north—the Sahara Desert existed then as well—and Asia was a mix of tropical deserts in the west, alpine deserts in China, and grasslands in the Indian subcontinent.
Several large animals like the woolly mammoth, the mastodon, the giant beaver, and the saber-toothed tiger roamed the world in extremely harsh conditions, but sadly all are extinct today.
However, not all megafauna from the LGM disappeared forever; many species are still alive, including the Bactrian camel, the tapir, the musk ox, and the white rhinoceros—though the latter is now an endangered species.
Will There Be Another Ice Age?
In a technical sense, we’re still in an “ice age” called the Quaternary Glaciation, which began about 2.6 million years ago. That’s because a permanent ice sheet has existed for the entire time, the Antarctic, which makes geologists call this entire period an ice age.
We are currently in a relatively warmer part of that ice age, described as an interglacial period, which began 11,700 years ago. This geological epoch is known as the Holocene.
Over billions of years, the Earth has experienced numerous glacial and interglacial periods and has had five major ice ages:
Major Ice Ages | Name | Time Period (Years Ago) |
---|---|---|
1 | Huronian Glaciation | 2.4 billion - 2.1 billion |
2 | Cryogenian Glaciation | 720 million - 635 million |
3 | Andean-Saharan Glaciation | 450 million - 420 million |
4 | Late Paleozoic ice age | 335 million - 260 million |
5 | Quaternary Glaciation | 2.6 million - present |
It is predicted that temperatures will fall again in a few thousand years, leading to expansion of ice sheets. However there are a dizzying array of factors that are still not understood well enough to say comprehensively what causes (or ends) ice ages.
A popular explanation says the degree of the Earth’s axial tilt, its wobble, and its orbital shape, are the main factors heralding the start and end of this phenomenon.
The variations in all three lead to a change in how much prolonged sunlight parts of the world receive, which in turn can cause the creation or melting of ice sheets. But these take thousands of years to coincide and cause a significant change in climate.
Furthermore, current industrial activities have warmed the climate considerably and may in fact delay the next ice age by 50,000-100,000 years.
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