Slavery was most common in Africa, India, China, Europe, Japan, the Middle East, South America, North America, even Australia, Southeast Asia, and Micro- and Polynesia. Slavery has existed in every culture, on every continent (with the exception of Antarctica). It has no common region.
Blood group A is the most common bloodtype in Europe.
The most common continent is Asia, which is the largest and most populous continent on Earth, covering about 30% of the planet's land area and home to over 60% of the world's population.
Catholicism is most common in Western Europe, predominately Southern (Portugal, Spain, and Italy).
The Southern region
fruit
Unitary states are most common in Europe, with countries like France, Italy, and Spain adopting this system. These states have a centralized government structure where authority is concentrated at the national level. Unitary systems are also found in countries in Asia and Africa.
The most common spoken language in Europe is Russian, with approximately 120 million native speakers.
Giardiasis is most prevalent in Eastern Europe.
Swords
Christianity.
Europe