World history Which event from the contemporary period (1900-present) has had the greatest impact on the world in 2021? Provide 5 specific pieces of evidence to support your answer and explain why they support your view.

coronavirus

Explanation:

it is because thousands of people died because of this.

it has sent the whole world in quarantine

unable to find cure

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: