World history question help?

Within the period from 1450 to 1800, compare the processes (e.g., political, social, economic) of empire building in the Spanish Empire with the empire building processes in one of the following:
The Ottoman Empire or The Russian Empire

Could someone just give me a few main points I could use to answer this?
(It's not homework, -.- it's a practice question from a website I'm studying with.)

Thank you :D
 
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