What evidence can you present that the manifest destiny travel wasn't easy as the Americans had thought it would be?

With Manifest Destiny, most Americans got some chances to move, explore, and discover new places other than their usual community, and this was very beneficial in so many ways. The exploration is great for personal gain, socially, spiritually, and emotionally as well as economic improvement

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).