It has often been argued that the United States is a “melting pot” of cultures. which is the best explanation of what this means?

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

need more info

explanation:

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.