Can someone answer all of these questions?

Who was the democratic nominee for president in the election of 1868? a) ulysses s. grant b) horatio seymour c) samuel tilden d) charles sumner

Why was the outcome of oswald’s trial for the assassination of president kennedy

In ohio in 1872, the cleveland massacre was a violent labor dispute at standard oil refineries in cleveland. a takeover by standard oil of the refineries in cleveland. an attempt to stop standard oil from becoming a monopoly. a failed attempt by standard oil to take over other refineries.