Henry Ma’s views on life in Marin County changed after he had two girls. He moved to the county from New York with his wife six years ago, and started to notice something about where he lived when he realized his daughters were the only two Asians at their school.

Henry eventually started taking note of this in his everyday life. Anytime he saw another Asian in his neighborhood, he would do a double take. It made him wonder: if the Bay Area is one of the most diverse places in the country, why is Marin County so white? The answer to that question was important for Henry, who wondered how growing up in this environment would shape his daughter’s views of themselves — and the world around them. KQED’s Ericka Cruz Guevarra looks into how one of the whitest counties in the Bay Area got that way. Her story first aired on KQED’s Bay Curious podcast. Subscribe on iTunes.