Hoover Dam
112 people lost their lives working on the Hoover Dam. The first and last persons killed, JG Tierney and PW Tierney, were the father and son.

How Many Spikes Are on Statue of Liberty?
(1)  5,  (2)  7,  (3)  9,  (4)  12,  (5)  19?

There are 7 spikes.

Which River is Dyed Green on St Patrick's Day
Chicago is famous for this annual event: dyeing the Chicago River green. The tradition started in 1962, when city pollution-control workers used dyes to trace illegal sewage discharges and realized that the green dye might provide a unique way to celebrate the holiday (St. Patrick's Day). That year, they released 100 pounds of green vegetable dye into the river - enough to keep it green for a week! Today, in order to minimize environmental damage, only forty pounds of dye are used.

Niagara Falls Solidified At Any Time?
Yes. The winter of 1932 was so cold in America, that Niagara Falls froze completely solid.

Which State is called "The State of 10,000 Lakes"
(1) Minnesota, (2) Michigan, (3) Idaho, (4) Washington

It is Minnesota

What is the Highest Military Medal Awarded in the USA
(1) Medal of Honor,  (2) Silver Star,  (3) Soldier's Medal,  (4) Purple Heart, or (5) Legion of Merit

The Medal of Honor is the highest military decoration that can be bestowed upon an American. Awarded for personal acts of valor above and beyond the call of duty. The medal is awarded by the President of the United States in the name of Congress. Although the medal is sometimes referred to as the Congressional Medal of Honor, the original and official title is the "Medal of Honor".

Which is the Longest River of the US?
(1) Colorado River,  (2) Mississippi River,   (3) Missouri River,  (4) Arkansas,   (5) Rio Grande River

It is Missouri River. It is also the longest tributary of the US. Rising in the Rocky Mountains, it flows East and South for 2540 miles before meeting the Mississippi River North of St Louis, Missouri. It flows through US 10 states and 2 Canadian Provinces. Combined with lower Mississippi River it forms the world's 3rd largest River system.

Name the 5 Great Lakes of USA.
(1) Lake Superior,  (2) Lake Huron,  (3) Lake Michigan,  (4) Lake Eerie,  (5) Lake Ontario

What Famous North American Landmark is Constantly Moving Backward?
Niagara Falls: Its rim is worn down about two and a half feet each year because of the millions of gallons of water rushing over it every minute.

In what year was the ZIP code system introduced?
(1) 1910,  (2) 1936,  (3) 1952,  (4) 1963

On July 1, 1963, non-mandatory ZIP codes were announced for the entire country. Simultaneously with the introduction of the ZIP code, two-letter state abbreviations were introduced. Robert Moon, an employee of the post office, is considered the father of the ZIP code; he submitted his proposal while working as a postal inspector.

Mammoth Cave, the longest cave system in the world, is a national park located in what U.S. state?
(1) Missouri,  (2) Kentucky,  (3) South Dakota,  (4) New Mexico

Mammoth Cave National Park is a US National Park in central Kentucky. Mammoth Cave is the world's longest-known cave system with over 285 miles of surveyed cave passageways. The official name of the system is the Mammoth-Flint Ridge Cave System for the ridge under which the cave has formed. The park was established as a national park on July 1, 1941. The cave was designated a World Heritage site in 1981 and a biosphere reserve in 1990 by the United Nations World Heritage Centre.

Alaska Has a Sand Dune
The great Kobuk Sand Dunes in Alaska lie some 40 miles above the Arctic Circle, yet Summer temperature can soar there to 100 degrees Fahrenheit. One of Alaska's true oddities, in some places, the sand dune stands above 100 feet high. The three clusters of dunes within the Park, the Great Kobuk, the Little Kobuk, and the Hunt River Sand Dunes, cover 25 square miles area and constitute the largest active sand dunes within Arctic region.

London Bridge Over Lake Havasu
The original London Bridge was shipped, stone by stone and reconstructed in Lake Havasu City. When the bridge. built ikn 1830s, began to sink in Thames River in the 1960s. It was replaced by a more modern concrete bridge. Then the England put all its stones for sale in 1967. A man named Robert B McCulloch Sr purchased the bridge on April 17, 1968. at the cost of US$2,460,000, The 10,246 blocks were shipped to Arizona and reassembled over a lagoon at the edge Lake Havasu to a cost of US$3 million. The bridge opened in 1971.

Buying the States
Many states have been bought by the US at various times.

USA bought  Virgin Islands  from Denmark  for $25 million   in 1917

Yellowstone National Park, CA
The Grand Prismatic Spring - in Yellowstone National Park is the largest hot spring in the United States, and the third largest in the world, after Frying Pan Lake in New Zealand and Boiling Lake in Dominica. It is located in the Midway Geyser Basin. The bacteria produce colors ranging from green to red; the amount of color in the microbial mats depends on the ratio of chlorophyll to carotenoids and on the temperature of the water which favors one bacterium over another. In the summer, the mats tend to be orange and red, whereas in the winter the mats are usually dark green. The center of the pool is sterile due to extreme heat. The deep blue color of the water in the center of the pool results from the intrinsic blue color of water, itself the result of water's selective absorption of red wavelengths of visible light. Though this effect is responsible for making all large bodies of water blue, it is particularly intense in Grand Prismatic Spring because of the high purity and depth of the water in the middle of the spring.

Mammoth Hot Springs - is a large complex of hot springs on a hill of travertine in Yellowstone National Park. The hot water that feeds Mammoth comes from Norris Geyser Basin after traveling underground via a fault line. Terrace Mountain at Mammoth Hot Springs is the largest known carbonate depositing spring in the world.

Black Pool - Yellowstone National Park, CA, USA. The pool was cool enough up until 1991 for dark orange-brown cyanobacteria to grow throughout the pool. When combined with the blue of the water, the pool appeared to be an exceptionally dark green to almost black, hence the name. An exchange of function took place in 1991, shifting thermal energy to Black Pool , causing them to heat up. Black Pool's temperature became hot enough to kill all the cyanobacteria in the pool, turning the pool a rich teal blue color. The pool also had frequent boiling eruptions on August 15, 1991. Black Pool remains extremely hot, and is now one of Yellowstone's most beautiful and intensely blue pools. The name of the pool remains "Black Pool."