honolulu
Honolulu dates from the 12th century.
Centennial, Colorado was incorporated February 7th, 2001. With over 100,000 residents, it was the largest incorporation in US history at the time. One of its biggest problems was the refusal of the US Post Office (as well as UPS) to recognize the city.
I'm sure there are newer cities incorporated in the ensuing 10 years, however.
The newest city in the US is Jurupa Valley, California who was incorporated on July 1, 2011.
hawii
the newest computer in the us is the laptop
the newest is forest police. In 2012.
they are the newest team
Continental Airlines has the newest fleet of any US carrier.
Justice Elena Kagan joined the US Supreme Court in August 2010, and is currently the newest member. She grew up on the Upper West Side of New York City, NY.
Hawaii is the newest state in the US. Rhode Island is not even close.
Astana, Kazakhstan
The newest senator of Illinois is Tammy Duckworth.
The newest city in Wales is Newport, granted city status by Queen Elizabeth II in 2002. The next newest is St. David's, which was officially granted city status in 1994. However traditionally it has been reputed to have been a city since the year 550 AD when Saint David founded the city, and there has been a cathedral there for centuries.
That is a matter of your opinion, not ours.