Why are immigrants coming to the United States now ?

Immigrants are coming to the United States now because they are seeking the ability to freely worship, to express themselves without fear of government retribution, and to chart their own economic destiny. It is true that America does not look like what it did in the past. Work has always been the great magnet attracting migrants to the United States. Historically, immigrants tackled jobs that native-born Americans avoided, such as digging canals, building railroads, or working in steel mills and garment factories. Also, it was perceived as the land of economic opportunity.

Explanation:

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!

after the roman empire, the catholic church began to unify by taking on many duties of a government.