which words and phrases in the passage show credibility?
Ancient Rome
Rome was once just a small town in central Italy. But most history students know that Rome had begun to turn into a massive empire by 200
BC. This empire covered a major part of Europe, Britain, west Asia, and northern Africa. Ancient Romans also brought about the modern
Western alphabet, and they were involved in the emergence of Christianity as a major world religion. According to a blog maintained by the
History Department at Harvard University, Rome was a republic for 450 years until it became an empire under Julius Caesar. The British
Museum has determined that the fall of the Roman Empire took place by the fifth century AD. The empire's fall is said to be one of the most
shocking and dramatic events in the history of human civilization.

According to a blog maintained by the History Department at Harvard University, Rome was a republic for 450 years until it became an empire under Julius Caesar.

The British Museum has determined that the fall of the Roman Empire took place by the fifth century AD

These two senteces above are used in the passage to show credibility.

This is because they make reference to two institutional authorities that have credibility and prestige in academic history, and the cultural world: the History Department at Harvard, and the British Museum.

In other words, the Harvard and the British Museum are the sources of the passage.