What characterizes the present political era that began in 1968?

The correct answer to this open question is the following.

What characterizes the present political era that began in 1968 is the permanent division of political power between the two dominant political parties in the United States. A division of government between Republicans and Democrats that has marked a deep division between citizens in some parts of the country.

according to worldatlas.com, the u.s. has an 86% literacy rate.

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.