The United States shouldn't send troops to fight ISIS because of the casualties. Ground fighting will result in more casualties on the US side than it will on the ISIS side. The reason being that ISIS knows the terrain and will fight in a guerilla style warfare. If the US bombs ISIS then it will result in Innocent civilian lives lost. Which may angry to the US involvement.
The roman empire fell because
peasant rebellions
civil war
foreign invasions
Ibn Al-Haytham was a famous muslim scholar whose works spanned many fields. He was a surgeon, doctor, but also a philosopher, mathematician, and astronomer. He was truly a great mind who significantly contributed towards the life we have today.
Francisco Pizarro was the person who seized the Inca Empire for Spain.
He was one of the first conquistadors who led an expedition to the Inca Empire in today's Peru to claim it for Spain in the 16th century, by killing Incan emperor Atahualpa.
Feudalism declined, increased trade between the middle east and it helped spread cultural diffusion.
-Lucky
