What caused the islamic empire to expand from a small area near mecca in 600s ce to size it was in 1258 when the empire collapsed?

Germany began the 1930s with an extremely weak economy, but the nazis soon established adictatorship; as a result, the government could pursue militaristic policies without fear of opposition. bycontrast, japan entered the 1930s with a relatively strong economy but a divided government; manypowerful japanese officials opposed military expansion.

No you have to answerwhy not when