Write a brief description of how counties originated in the United States and how they have changed over time.

The United States began regulating immigration soon after it won independence. since enacted have reflected the politics and migrant flows of the times. ... How U.S. immigration laws and rules have changed through history . years of residence in the country and “good moral character,” and an applicant

Explanation:

Which file extension indicates a text document?  

A- .txt

B- .ppt  

C-.tst

D- .pdf