Sentence: Native Americans are one of the ethnic groups in the United States of America which has the capital city Washington, D.C. Akron is located within Summit County, Ohio in the United States and the leader is the mayor.

What structured data could we extract from this sentence?
United States, capital, Washington, D.C.; United States, ethnicGroup, Native Americans in the United States; Akron, Ohio, leaderTitle, Mayor; Akron, Ohio, country, United States; Akron, Ohio, isPartOf, Summit County, Ohio