Aren't work and employment the same thing?
While your question could use some work to make it understandable, I'll venture a guess as to what you are asking.
Before the bridge was built the only way people (and merchandise) could get from the City of Brooklyn (it wasn't a borough yet) to the City of New York (Manhattan) was by ferry (which was greatly affected by weather conditions. People tended to work as close to where they lived as they could. People who lived in Brooklyn but worked in Manhattan had to allow for much longer travel time (the same for people who lived in Manhattan and worked in Brooklyn).
When the bridge opened in 1883, it provided for easier access for all these people. They weren't affected by the weather as much as the ferries. When it opened there was even a cable-car operation from one side to the other making crossing rather fast. The cable car was replaced by a trolley and also an elevated train. The result is that more people could live in one city and work in the other because it took much less time to get to work (or to get home).
More businesses were able to open in either Manhattan or Brooklyn because it was much easier to use trucks (horse-drawn back in those days) to cross the bridge in order to get merchandise delivered rather than depend on the ferries. Also it make it easier fo rpeople to go to these businesses to buy the merchandise.
how did 9/11 change peoples lives
she didn't change peoples lives she could threw her songs...
how did clearance Thomas change peoples lives
How did plows change people lives
it hasn't
It ended them
Miricals
yes
because
It didnt.
how did the use of iron change peoples lives
watch the flinstones