Why did Christianity spread across Africa in the second century?

Axumite currency had Christian symbols.
Trade in Axum was limited to Christian traders.
People were forced to adopt Christian beliefs.
Monasteries and writers promoted Christian teachings.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.

Where people were very broke no jobs were available and everyone was struggling

The dethroned emperor!