Sumerians buildings were more like artificial hills and the art work was mainly about exploring and supporting the relationships between people and the gods
<span>Britain had access to a number of natural resources, such as iron and coal. The agricultural sector of the British economy had been steadily growing during the 18th century. </span>
I believe an Initiative is C. A vote on a legislative measure.
Byzantium/Constantinople was conquered in 1451, but the empire continued to decline starting around the 18th or 19th centuries. It officially died in WWI. As for how long it was a major threat to Europe, the empire's prime was the 16th century, under Suleiman the Magnificent.