Which phrase best describes the era from 1789 to 1800 in U. S. history A. Fighting for independence
B. Expanding the borders of the nation
C. Putting the Constitution into effect
D. Settling the issue of slavery​

it is either B or D

Explanation:

A

Explanation:

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation:

explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali