The pronoun is capitalized even when it’s part of what

The characters were born in diferentes times in  USA.

The aspects in common  of both are:

1) Both were born in United States of America.

2) Both were famous, many people talk about them due to their public life.

3) Mr. Edison was an inventor of many things and Reeve represented a superhero who could change the time of the humanity.  

4) Edison was called a businessman and Reeve was a businessman but at the cinema industry.