Why did Stephen Ambrose call America’s participation in WWII a lamentable irony?

Which statement best describes a major advantage of a confederal system of government over a unitary system

Why did the collapse of the soviet union and the power vacuum in the balkans lead to bosnian genocide?

Which of these innovations led to increased production in american factories in the early 1800s? a. the use of interchangeable parts b. the construction of canals c. the invention of the mechanical reaper d. the availability of electricity