3. The period between 1920 to the United States' entry into World War II is sometimes called
the age of

The period of time between 1920 and the U.S. entry into World War II has been called an Age of Isolationism, although that isn't 100% accurate. I mean, for one thing the U.S. sponsored a series of arms reduction negotiations that resulted in the Washington treaties limiting the number of battleships that a country could possess.

Explanation:

the us constitution is a living document, meaning that it can be changed over time as the country changes.

regarding the law, the 15th amendment was specifically designed thinking in the rights of black free men.

even though ratified on february 3, 1870, the promise of the 15th amendment would not be fully applied for a long time.poll taxes and literacy tests would allow southern states disenfranchise african americans. only in 1965 the voting rights for african americans would be actually able to vote in the south.

in 1965, president johnson signed the voting rights act, which aimed to overcome legal barriers that prevented african americans from voting as it was guaranteed by the 15th amendment to the u.s. constitution.