The runs north and south and marks 0 degrees east and west.

Nation of conflicting ethnic groups

The answer is d if you are on edgenuity. 

Answerbecause of improved transportation, communication, and other advantages;

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion