Answer:
Rome was able to gain its empire in large part by extending some form of citizenship to many of the people it conquered. Military expansion drove economic development, bringing enslaved people and loot back to Rome, which in turn transformed the city of Rome and Roman culture.
Answer:
I could be wrong im not entirely sure but I think the answer would be automobile
Answer:
No (ignore the filler lol)
The crusades were created by western European Christians after centuries of Muslim wars of expansion. To stop the expansion of Muslim states they had to reclaim christianity and the holy land in the middle east.