In civilization V: Brave New World, will other countries (all are AIs) act different if you enter an era?

In civilization V: Brave New World, will other countries (all are AIs) act
different if you enter an era?

In CiV (civilization V) Brave New World, will other countries (all are
AIs) act different if you enter an era? For example if you were to enter
the renaissance (or whatever) era, would other countries reach that
faster? I know that developing nukes does something along those lines, but
does reaching eras?