The Most Widespread Blood Types, by Country
Blood is essential to the human body’s functioning. It dispenses crucial nutrients throughout the body, exchanges oxygen and carbon dioxide, and carries our immune system’s “militia” of white blood cells and antibodies to stave off infections.
But not all blood is the same. The antigens in one’s blood determine their blood type classification: There are eight common blood type groups, and with different combinations of antigens and classifications, 36 human blood type groups in total.
Using data sourced from Wikipedia, we can map the most widespread blood types across the globe.
Overall Distribution of Blood Types
Of the 7.9 billion people living in the world, spread across 195 countries and 7 continents, the most common blood type is O+, with over 39% of the world’s population falling under this classification. The rarest, meanwhile, is AB-, with only 0.40% of the population having this particular blood type.
Breaking it down to the national level, these statistics begin to change. Since different genetic factors play a part in determining an individual’s blood type, every country and region tells a different story about its people.
Regional Distribution of Blood Types
Even though O+ remains the most common blood type here, blood type B is relatively common too. Nearly 20% of China’s population has this blood type, and it is also fairly common in India and other Central Asian countries.
Comparatively, in some West Asian countries like Armenia and Azerbaijan, the population with blood type A+ outweighs any others.
The O blood type is the most common globally and is carried by nearly 70% of South Americans. It is also the most common blood type in Canada and the United States.
Here is a breakdown of the most common blood types in the U.S. by race:
O+ is a strong blood group classification among African countries. Countries like Ghana, Libya, Congo and Egypt, have more individuals with O- blood types than AB+.
The A blood group is common in Europe. Nearly 40% of Denmark, Norway, Austria, and Ukraine have this blood type.
O+ and A+ are dominant blood types in the Oceanic countries, with only Fiji having a substantial B+ blood type population.
More than 41% of the population displays the O+ blood group type, with Lebanon being the only country with a strong O- and A- blood type population.
Nearly half of people in Caribbean countries have the blood type O+, though Jamaica has B+ as the most common blood type group.
Here is the classification of the blood types by every region in the world:
Unity in Diversity
Even though ethnicity and genetics play a vital role in determining a person’s blood type, we can see many different blood types distributed worldwide.
Blood provides an ideal opportunity for the study of human variation without cultural prejudice. It can be easily classified for many different genetically inherited blood typing systems.
Our individuality is a factor that helps determine our life, choices, and personalities. But at the end of the day, commonalities like blood are what bring us together.
Where Will the World’s Next 1,000 Babies Be Born?
This graphic paints a picture of the world’s population, showing which countries are most likely to welcome the next 1,000 babies.
Where Will the World’s Next 1,000 Babies Be Born?
View a higher resolution version of this map.
Every four minutes, approximately 1,000 babies are born across the globe. But in which countries are these babies the most statistically likely to come from?
Using data from the CIA World Factbook, this graphic by Pratap Vardhan (Stats of India) paints a picture of the world’s demographics, showing which countries are most likely to welcome the next 1,000 babies based on population and birth rates as of 2022 estimates.
The Next 1,000 Babies, By Country
Considering India has a population of nearly 1.4 billion, it’s fairly unsurprising that it ranks first on the list. Of every 1,000 babies born, the South Asian country accounts for roughly 172 of them.
|Place||Region||Births Per 1,000 Global Babies|
|🇨🇩 Congo, Democratic Republic of the||Africa||31.90|
|🇺🇸 United States||Americas||30.42|
|🇿🇦 South Africa||Africa||7.84|
|🇨🇮 Cote d'Ivoire||Africa||5.97|
|🇧🇫 Burkina Faso||Africa||5.41|
|🇬🇧 United Kingdom||Europe||5.37|
|🇸🇦 Saudi Arabia||Asia||3.69|
|🇸🇸 South Sudan||Africa||3.19|
|🇰🇵 Korea, North||Asia||2.71|
|🇰🇷 Korea, South||Asia||2.63|
|🇱🇰 Sri Lanka||Asia||2.35|
|🇸🇱 Sierra Leone||Africa||2.06|
|🇵🇬 Papua New Guinea||Oceania||2.04|
|🇩🇴 Dominican Republic||Americas||1.42|
|🇨🇫 Central African Republic||Africa||1.31|
|🇨🇬 Congo, Republic of the||Africa||1.30|
|🇸🇻 El Salvador||Americas||0.86|
|🇦🇪 United Arab Emirates||Asia||0.79|
|🇨🇷 Costa Rica||Americas||0.55|
|🇵🇸 West Bank||Asia||0.54|
|🇳🇿 New Zealand||Oceania||0.47|
|🇭🇰 Hong Kong||Asia||0.43|
|🇵🇸 Gaza Strip||Asia||0.41|
|🇬🇶 Equatorial Guinea||Africa||0.37|
|🇧🇦 Bosnia and Herzegovina||Europe||0.24|
|🇵🇷 Puerto Rico||Americas||0.18|
|🇲🇰 North Macedonia||Europe||0.16|
|🇸🇧 Solomon Islands||Oceania||0.12|
|🇹🇹 Trinidad and Tobago||Americas||0.11|
|🇨🇻 Cabo Verde||Africa||0.08|
|🇸🇹 Sao Tome and Principe||Africa||0.04|
|🇧🇸 Bahamas, The||Americas||0.04|
|🇳🇨 New Caledonia||Oceania||0.03|
|🇵🇫 French Polynesia||Oceania||0.03|
|🇱🇨 Saint Lucia||Americas||0.01|
|🇫🇲 Micronesia, Federated States of||Oceania||0.01|
|🇲🇭 Marshall Islands||Oceania||0.01|
|🇦🇬 Antigua and Barbuda||Americas||0.01|
|🇻🇨 Saint Vincent and the Grenadines||Americas||0.01|
|🇻🇮 Virgin Islands||Americas||0.01|
|🇮🇲 Isle of Man||Europe||0.01|
|🇲🇵 Northern Mariana Islands||Oceania||0.01|
|🇹🇨 Turks and Caicos Islands||Americas||0.01|
|🇫🇴 Faroe Islands||Europe||0.01|
|🇦🇸 American Samoa||Oceania||0.01|
|🇰🇾 Cayman Islands||Americas||0.01|
|🇰🇳 Saint Kitts and Nevis||Americas||0.00|
|🇸🇽 Sint Maarten||Americas||0.00|
|🇲🇫 Saint Martin||Americas||0.00|
|🇻🇬 British Virgin Islands||Americas||0.00|
|🇸🇲 San Marino||Europe||0.00|
|🇼🇫 Wallis and Futuna||Oceania||0.00|
|🇨🇰 Cook Islands||Oceania||0.00|
|🇸🇭 Saint Helena, Ascension, and Tristan da Cunha||Africa||0.00|
|🇧🇱 Saint Barthelemy||Americas||0.00|
|🇫🇰 Falkland Islands (Islas Malvinas)||Americas||0.00|
|🇵🇲 Saint Pierre and Miquelon||Americas||0.00|
It’s worth noting that, while India ranks number one on the list, the country’s birth rate (which is its total number of births in a year per 1,000 individuals) is actually slightly below the global average, at 16.8 compared to 17.7 respectively.
China, which comes second on the list, is similar to India, with a high population but relatively low birth rate as well. On the other hand, Nigeria, which ranks third on the list, has a birth rate that’s nearly double the global average, at 34.2.
Why is Nigeria’s birth rate so high?
There are various intermingling factors at play, but one key reason is the fact that Nigeria’s economy still is developing, and ranks 131st globally in terms of GDP per capita. Further, access to education for women is still not as widespread as it could be, and research shows that this is strongly correlated with higher birth rates.
The World’s Population Growth Rate is Declining
While there are hundreds of thousands of babies born around the world each day, it’s worth mentioning that the world’s overall population growth rate has actually been declining since the 1960s.
This is happening for a number of reasons, including:
- Increased wealth around the world, which research has correlated with fewer births
- Various government policies discouraging large families
- The global shift from rural to urban living
By 2100, global population growth is expected to drop to 0.1%, which means we’ll essentially reach net-zero population growth.
This would increase our global median age even further, which poses a number of economic risks if countries don’t properly prepare for this demographic shift.
All the Contents of the Universe, in One Graphic
We explore the ultimate frontier: the composition of the entire known universe, some of which are still being investigated today.
All the Contents of the Universe, in One Graphic
Scientists agree that the universe consists of three distinct parts: everyday visible (or measurable) matter, and two theoretical components called dark matter and dark energy.
These last two are theoretical because they have yet to be directly measured—but even without a full understanding of these mysterious pieces to the puzzle, scientists can infer that the universe’s composition can be broken down as follows:
|Free hydrogen and helium||4%|
Let’s look at each component in more detail.
Dark energy is the theoretical substance that counteracts gravity and causes the rapid expansion of the universe. It is the largest part of the universe’s composition, permeating every corner of the cosmos and dictating how it behaves and how it will eventually end.
Dark matter, on the other hand, has a restrictive force that works closely alongside gravity. It is a sort of “cosmic cement” responsible for holding the universe together. Despite avoiding direct measurement and remaining a mystery, scientists believe it makes up the second largest component of the universe.
Free Hydrogen and Helium
Free hydrogen and helium are elements that are free-floating in space. Despite being the lightest and most abundant elements in the universe, they make up roughly 4% of its total composition.
Stars, Neutrinos, and Heavy Elements
All other hydrogen and helium particles that are not free-floating in space exist in stars.
Stars are one of the most populous things we can see when we look up at the night sky, but they make up less than one percent—roughly 0.5%—of the cosmos.
Neutrinos are subatomic particles that are similar to electrons, but they are nearly weightless and carry no electrical charge. Although they erupt out of every nuclear reaction, they account for roughly 0.3% of the universe.
Heavy elements are all other elements aside from hydrogen and helium.
Elements form in a process called nucleosynthesis, which takes places within stars throughout their lifetimes and during their explosive deaths. Almost everything we see in our material universe is made up of these heavy elements, yet they make up the smallest portion of the universe: a measly 0.03%.
How Do We Measure the Universe?
In 2009, the European Space Agency (ESA) launched a space observatory called Planck to study the properties of the universe as a whole.
Its main task was to measure the afterglow of the explosive Big Bang that originated the universe 13.8 billion years ago. This afterglow is a special type of radiation called cosmic microwave background radiation (CMBR).
Temperature can tell scientists much about what exists in outer space. When investigating the “microwave sky”, researchers look for fluctuations (called anisotropy) in the temperature of CMBR. Instruments like Planck help reveal the extent of irregularities in CMBR’s temperature, and inform us of different components that make up the universe.
You can see below how the clarity of CMBR changes over time with multiple space missions and more sophisticated instrumentation.
What Else is Out There?
Scientists are still working to understand the properties that make up dark energy and dark matter.
NASA is currently planning a 2027 launch of the Nancy Grace Roman Space Telescope, an infrared telescope that will hopefully help us in measuring the effects of dark energy and dark matter for the first time.
As for what’s beyond the universe? Scientists aren’t sure.
There are hypotheses that there may be a larger “super universe” that contains us, or we may be a part of one “island” universe set apart from other island multiverses. Unfortunately we aren’t able to measure anything that far yet. Unravelling the mysteries of the deep cosmos, at least for now, remains a local endeavor.