The main things are Funions and Geography. Hope this helps!!
marble i think since they build a few temples for the gods with marble but normal people would build with mud idk if it can be called cement.
Answer:
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<span>B. During the period of Viking, Magyar, and Muslim invasions</span>
The new line would support communities and military outposts on the frontier. It would give settlers safe and dependable passage west. And most importantly, it would tie new states California and Oregon to the rest of the country. it would also help deliver mail across the nation much faster