What historical event occurred during walt whitman’s life

In an essay of 400 words, summarize the responsibilities of the three branches of the united states government and the system of checks and balances. what is the purpose of the system of checks and balances?

How did slavery end in the united statesa. it ended with the emancipation proclamationb. it ended when the union won the civil warc. it ended with the fifteenth amendmentd. it ended with the 13th amendment

The main reason that the royal society of london developed the modern form of peer review was to: award grant funding. decide on promotions for researchers. streamline the publication of conference proceedings. control the quality of published papers.