How did Temujin grow an army? *​

to act quickly in times of danger to the united states

because you have to act quickly if you want to live/survive.

on my last question

the western roman empire flourished, but the eastern portion of the empire struggled.

the romans were initially interested in expansion via sicily (which at that time was a cultural melting pot), part of which lay under carthaginian control. at the start of the first punic war (264-241 bc), carthage was the dominant power of the western mediterranean, with an extensive maritime empire