We know this by dating the structures, evidence of life there long before anywhere else and by the Bible. You can also look into other sources of history too. There is a ton of info on Egypt provided by scrolls a old writing on stone tablets.
Public health and environmental problems were bad for the people of rome
The answer is yes, definitely. The Roman empire grew so big that their sphere of influence reached even China (through trade most probably). There are so many achievements that the Roman empire can boast, one of which is none other than achitecture. You may not notice it, but if you look closely you'll see that most of the government's structures and or bank's structures have Greco-Roman touch about them.
And definitely you will notice that there are many Christians here and there - that's brought to you by the Roman empire who grew so big that when emperor Constatine decided to legalize Christianity, the religion spread like wild fire in the old world! This development still affects us up to now. Where is the pope's seat of power? Is it not in the Vatican, the heart of Rome?
WWI tanks were used to lead infantry advances across no mans land (option a ). It was a welcome development, as it was hoped it would help ending the long and casualties provoking trenches type of war.
U.S. foreign policy shifted away from "isolationism" to international involvement, since the US started to steer away from Washington's idea that it should remain as detached from foreign issues as possible.
