disproportionally about US-Americans and the politicians among them. Many more politicians are waiting to be identified for what they are. When you add it all up, there should be as much as 47,872 politicians from the USA.
When you compare the number of US-politicians with all the Brazilians, all 30,123 of them, systemic bias is obvious. At this time we know in Wikidata about 36,384 politicians for the rest of the world, proving the same point in another way.
What would be neat is when Wikidata knew about all the politicians who are currently a member of a parliament anywhere in the world.