In the twentieth century, urban areas were defined as communities of more than

In the twentieth century, urban areas were defined as communities of more than 2,500

Explanation:

During the Civil War, American cities expanded even faster as industrialisation and globalisation began. By the turn of the 20th century, the US eastern coast towns were almost inconceivable, and many of their inhabitants were still living in misery. Often extremely corrupt is their local government, police forces, and companies.

Apart from this increase of urbanisation, the US has become more and more global since its foundation. More than 3/5 of the US population today resides in an urban area (usually defined as an integrated region with a minimum population of 2,500) and much less than a quarter is living in a rural area.

the answer is b hope that