Why was Adoff Hitler concerned with issues such as content and style of art?

Adolf Hitler had strong ideas about art, especially the art contained in architecture. As an aside, his own career as an artist in Vienna was a failure. However, once in power (MORE)
In Slavery

Why did it take so long to abolish slave trade from the British empire?

Britain itself was - contrary to what the question suggests - an early abolitionist, its Parliament passing a law that abolished the slave trade though the whole of the Empire (MORE)

What are some historical sites in south America?

Machu Picchu, Sacred Valley, Cusco Region, Peru Buenos Aires, Capital Federal District, Argentina Tulum, Yucatan Peninsula, Mexico Mexico City, Central Mexico and Gulf Coast L (MORE)