I will give my best shot. I think they justified their reason to conquer the Aztec and Inca Empires in the name of their religion, christianity
The steamboat. it helped travel rivers upstream
The Rough Riders was a nickname given to the 1st United States Volunteer Cavalry, one of three such regiments raised in 1898 for the Spanish–American War and the only one to see combat
C. Factors Leading to the American Revolution