What was one of the social changes during the city life and city culture.

What was one of the social changes during the Western Expansion.

Where?

When?

During the time of 1865 and 1945.

It doesn't matter where.

During the 1865 and 1945.

I assume you mean in the United States.

Some of the social changes:

People moved from farms to cities.
More people became involved with industry than agriculture.
Women became more independent, worked outside the home and voted.
Immigrants flocked to the U.S.
Two world wars gave us a global perspective.
Jews became more accepted.

Of course, it matters where.

People in China, Israel, India, Tunisia, Russia, Brazil, etc., etc. experienced other social changes.

Didn't the western expansion have something to do with Native Americans.

Yes. The Native Americans were forced on to reservations as European-Americans took over their lands.