As they had no correct method of communicating
Answer:
according to https://en.wikipedia.org/wiki/Christianity_in_Ethiopia Frumentius returned to Ethiopia, he was welcomed with open arms by the rulers who were at the time not Christian.
Explanation:
This period of time is known as Black Friday. In 1869, two people named Jay Gould and James Fisk, considering that at the time gold was still used as international currency, sought to corner the gold market by purchasing every single gold unit they could get their hands on. This caused the price of gold to highly rise for a small period of time, but having discovered the scheme of these two, former President Grant released millions of dollars in gold on a Friday. This release caused the price of gold to plummet, and the country entered economic turmoil.