When was the Fifteenth Amendment ratified? after the Civil War after World War I during the civil rights movement during segregation

What decision were made by the first congress during its first year that shape the future of the government

During the early period of spanish colonialism, the death of large numbers of native people led to what

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true.b) some other scientific experts read the papers and provide quality control by eliminating many mistakes.c) an editor reads the papers, to make sure that all the semicolons are in the correct places.d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog.e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.