Which of the following best describes how american westward expansion in
the 19th and 20th centuries influenced the regional and ethnic identities of
the united states?
a. as settlers migrated westward, they blended their ethnicities with
american indian cultures, living peacefully throughout the great
plains.
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b. settlers moved westward in search of industrial jobs and
education, creating extremely diverse urban communities.
c. as settlers migrated westward, they joined with others who shared
their culture to create new communities based on common
ethnicity
d. settlers lived a nomadic and violent lifestyle as they fought to
protect their caravans and searched for isolated places to create
new communities.

The correct answer is C, As settlers migrated westward, they joined with others who shared their culture to create new communities based on common ethnicity.

Many forerunners and founding fathers of America hailed from the East, American westward expansion was considered to be the hallmark because of many reasons. It all started when Thomas Jefferson bought Louisianan territory from France, he believed that for America to become a powerful block in the world, its west ward expansion is necessary.

There was vast and cheap availability of fertile lands in the west which could be used for erecting major factories and create employment opportunities that were mostly low paid in the east due to European restrictions.

Gold Rush in Oregon was an alluring factor for westward expansion. Environment in the west was compliant and the land was productive.  

The Persian Gulf War, which lasted from August 2nd, 1990 to February 28th, 1991, was a war over Iraq's invasion over Kuwait. Americans' major ally to protect was Kuwait at the time. 

I hope I was able to help you! :)