Which is the best source of historical evidence to learn about how an event unfolded

Historical documents. Most important events were written down by someone who witnessed it happen. Sometimes they're not completely accurate but it's the easiest way to get information.

The best source of historical evidence to learn about how an event unfolded is a newspaper account written when the event occurred. Newspapers constitute one of the most reliable sources of historical evidence due to the fact that it provides facts in terms of actual events. In the newspaper, you can find the date of the event as well as a detailed explanation of how the events occurred. On top of that, newspapers are likely to include facts and figures regarding the event and it is the least subjective source.

i believe the answer is a

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.