What challenges did the byzantine empire face from foreign forces?
avars and sassanids–

arabs–

bulgars–

Which statement best describes a contribution of the works of nicolas copernicus and galileo galilei?

Which one of these were common aspects of war efforts during world war 1 1. rationing 2. war bonds 3. using schools as military facilities 4. child soldiers 5. women working in factories circle all that apply

Why didn’t the portuguese have access to the territory that is present-day latin and north america