In European countries and countries with a history of colonization by European powers.
Germany and France
The country with the largest Catholic percentage of the population is Vatican City, at 100%.
People moved to the countries in the European Union for the better standard of living, from other countries.
Malta is the smallest and least populous of the European Union countries.
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All the European countries were still Catholic when Henry VII was on the throne, Germany and England would change faiths during Henry VIII's reign.
The main religion in Spanish-speaking countries is Christianity, with the majority of the population being Roman Catholic.
Probably any countries with a Christian or Catholic population
The three European countries with the lowest population density are Iceland, Norway, and Finland. These countries have vast, sparsely populated areas due to their rugged terrain and harsh climates.
Industrialization led to a burst in population for European countries (primarily Western).
The population of the European Union is roughly half a billion.