What problems did having a mercenary army cause for the roman empire?

How many citizens of mexico does it take to equal the ecological footprint of the average citizen of the united states? it takes nearly three mexican citizens to equal the ecological footprint of the average u.s. citizen. it takes about 12 mexican citizens to equal the ecological footprint of the average u.s. citizen. it takes just over eight mexican citizens to equal the ecological footprint of the average u.s. citizen. two citizens of mexico equal the ecological footprint of one average citizen of the united states. they are essentially equal?

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

Which of these were achievements of the safavid dynasty? check all that apply.