How has the helicopter changed since it was invented?

How was rationing managed? What are some of the wrongs done by the british listed in the decloration of independence? How did the idea of freedom motivate the US to get involved in both World War 1 and World War 2? How a struggle ensued for control of the flag who was finally successful? Why did Britain abandon her policy of splendid isolation? How many wars did Athens and Sparta have? How old was Sylvester Stallone in Rambo 3? What did Cambodia do in World War 2? What did Arthur Zimmerman do during World War 1? How did world war 2 change production? What were union armies named? What did the war on proverty include? To whom rick said The Germans wore grey you wore blue? When did the Bataan Death March end? Is the military a public good? which battle in which Napolean was finally defeated in 1815? Should you capitalize the phrase world war 2? Was What an impact World War 2 had on African Americans? What was the blackout in the blitz? Who won wilderness?