Title: USS Monitor
Content:  While the concept of ships protected by armor existed before the advent of the ironclad Monitor, the need for iron plating on ship arose only after the explosive shell-firing Paixhans gun was introduced to naval warfare in the 1820s. The use of heavy iron plating on the sides of warships was not practical until steam propulsion matured enough to carry its great weight. Developments in gun technology had progressed by the 1840s so that no practical thickness of wood could withstand the power of a shell. In response, the United States began construction in 1854 of a steam-powered ironclad warship, Stevens Battery, but work 
Title: Amphitrite-class monitor
Content:  to help pay for the new construction.  As the Navy's own shipyards lacked the capability to build ironclads at this time, Robeson approached four private shipyards—Harlan & Hollingsworth, William Cramp & Sons, John Roach & Sons and the Continental Iron Works, and offered them his "repair" contracts for Amphitrite, Terror, Miantonomoh and Puritan respectively. A fifth contract, for Monadnock, was accepted by a New York entrepreneur, Phineas Burgess. Continental Iron Works was the only firm to decline Robeson's offer, and consequently John Roach & Sons accepted the contracts to build both Puritan and Miantonomoh. However, Continental Iron Works would still participate in construction of the monitors through its 
Title: Skipper (cannon)
Content:  Due to its superior characteristics, brass was chosen for the barrel. The cadets were requested to donate whatever brass they could scavenge including: brass breastplates, belt buckles, and hat grommets. Large brass gears were obtained from a coal mine in Coalwood, West Virginia where Hickam's father was the superintendent. The cadets also retrieved spent brass bullet shell casings from the school's firing range. Arrangements were made to have the barrel made at the Virginia Foundry Company in Roanoke, Virginia. The foundry's president, Paul Huffman was sworn to secrecy and when the cadets asked about the forging price, he replied "You don't have enough, but I'm a member of the Corps Class of '37 and VPI has needed a cannon for a long time. We'll be 
Title: USS Monitor
Content:  After the United States received word of the construction of Virginia, Congress appropriated $1.5 million on 3 August 1861 to build one or more armored steamships. It also ordered the creation of a board to inquire into the various designs proposed for armored ships. The Union Navy advertised for proposals for "iron-clad steam vessels of war" on 7 August and Welles appointed three senior officers as the Ironclad Board the following day. Their task was to "examine plans for the completion of iron-clad vessels" and consider its costs. Ericsson originally made no submission to the board, but became involved when Cornelius Bushnell, the sponsor of the proposal that became the armored sloop USS Galena (1862), needed to have his design reviewed by a naval constructor. The board required a guarantee 
Title: American Civil War
Content:  an ironclad ship, , which was based on rebuilding a sunken Union ship, USS Merrimack (1855). On its first foray, on March 8, 1862, Virginia inflicted significant damage to the Union's wooden fleet, but the next day the first Union ironclad, USS Monitor, arrived to challenge it in the Chesapeake Bay. The resulting three-hour Battle of Hampton Roads was a draw, but it proved that ironclads were effective warships. Not long after the battle, the Confederacy was forced to scuttle the Virginia to prevent its capture, while the Union built many copies of the Monitor. Lacking the technology and infrastructure to build effective warships, the Confederacy attempted to obtain warships from Great Britain. However, this failed, because Great Britain had no interest in selling warships to a nation that was at war with a far stronger enemy, and doing so could sour relations with the U.S.
Title: Amphitrite-class monitor
Content:  The Amphitrite-class monitors were a class of four U.S. Navy monitors ordered in the aftermath of the Virginius affair with Spain in 1873. The four ships of the class included USS Amphitrite (BM-2), USS Monadnock (BM-3), USS Terror (BM-4), and USS Miantonomoh (BM-5). A fifth ship originally of the same design, USS Puritan (BM-1), was later fitted with extra armor and designated as a unique class. Puritan and the Amphitrite class were to remain under construction for an extraordinarily long period due both to design changes and to the reluctance of the US Congress to appropriate funds for their completion. Most of the vessels were only commissioned in the mid-1890s—more than twenty years after the commencement of construction. They were eventually to see active service in the Spanish–American War.
Title: USS Monitor
Content:  type of armored warship built for the American Navy over the next several decades. The remainder of the ship was designed by Swedish-born engineer and inventor John Ericsson, and built in only 101 days in Brooklyn, New York on the East River beginning in late 1861. Monitor presented a new concept in ship design and employed a variety of new inventions and innovations in ship building that caught the attention of the world. The impetus to build Monitor was prompted by the news that the Confederates were building an iron-plated armored vessel named the Virginia in the old Federal naval 
Title: Virginius Affair
Content:  When the Virginius affair first broke out, a Spanish ironclad—the Arapiles—happened to be anchored in New York Harbor for repairs, leading to the uncomfortable realization on the part of the US Navy that it had no ship capable of defeating such a vessel. US Secretary of War George M. Robeson believed a US naval resurgence was necessary. Congress hastily issued contracts for the construction of five new ironclads, and accelerated its existing repair program for several more. USS Puritan (BM-1) and the four monitors were subsequently built as a result of the Virginius war scare. All five vessels would later take part in the Spanish–American War of 1898.
Title: Rivadavia-class battleship
Content:  ship to a different shipyard in the hope that both would be completed faster, so Moreno was constructed by the New York Shipbuilding Corporation of Camden, New Jersey. The steel for the ships was largely supplied by the Bethlehem Steel Company of Pennsylvania, which, due to their ability to produce steel at a lower price than other nations, was an integral cost-saving measure. The Secretary of the Argentine Naval Commission, the body which chose the final design, said the reason the American tender was lower than that of the English was that "steel for construction work and armor-plating is a great deal cheaper in the United 
Title: George M. Robeson
Content:  the biggest U.S. warships, including an unfinished USS Puritan and four USS Miantonomahs. The ships were contracted out, torn down and scrapped, to be "rebuilt" as new warships by various contractors approved by Sec. Robeson. Work began in 1874, but Congress refused to give Robeson 2.3 million dollars to complete the ships. The almost complete USS Miantonomah was launched on December 6, 1876. Robeson was criticized for scrapping other monitors to pay for the new ones. Secretary of State Hamilton Fish in December 1874 coolly negotiated a peaceful settlement with Spain, and the State Department successfully arbitrated Spanish reparations to the families of the Americans who had been executed. The Virginius incident brought home the realities of having a weak navy and the need for a naval resurgence.

Question: where did they get the vibranium to make captain americas shield?
Answer: Wakanda.