Columbus discovered the mainland of Trinidad which he named after the holy trinity
Brought more jobs and less unemployment, reformers trying to get laws passed, organizing in labor unions that demand higher pay, shorter hours and safer working conditions. Men got the right to vote.
It means "year of our lord" in Latin, meaning the number of years since Jesus.
The years before the AD ones are labeled 'BC', for "Before Christ".
Both of those labels are the reasons why many people, especially
non-Christians, such as for example Jews and Muslims, prefer to
label the years as 'BCE' and 'CE', meaning "Before the Common Era"
and "Common Era".
It’s either c or d, I’ll put the actual answer in the comments just give me a sec