United States Trivia: Groups of 4 & 6

Each category has either four or six answers. Can you guess them all?
Sources: wikipedia.org, supremecourt.gov, history.army.mil, ourdocuments.gov, usmint.gov
Quiz by LtHurwitz
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Last updated: July 8, 2014
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First submittedJuly 8, 2014
Times taken232
Average score37.5%
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Female US Supreme Court Justices
Sandra Day O'Connor
Ruth Bader Ginsburg
Sonia Sotomayor
Elena Kagan
 
Current US State Capitals with the Same First Letter as Their State
Dover, DE
Honolulu, HI
Indianapolis, IN
Oklahoma City, OK
 
US Officers with the Rank of General of the Army During WWII
George Marshall
Douglas MacArthur
Dwight D. Eisenhower
Henry H. Arnold
"Big Six" US Civil Rights Leaders
James Farmer
John Lewis
Martin Luther King, Jr.
A. Philip Randolph
Roy Wilkins
Whitney Young
 
US Districts and Territories Honored on US Quarters
District of Columbia
The Commonwealth of Puerto Rico
Guam
American Samoa
The US Virgin Islands
The Northern Mariana Islands
+1
Level 75
Oct 21, 2015
Why can't I remember that Marianas has only one n???