What tactic did Ulysses S. Grant use successfully against the Confederates at Petersburg?

Ulysses S. Grant planned and successfully executed a siege attack against the Confederates Army at Petersburg. In the event know as "The Battle of the Crater" as part of The American Civil War, The Union Army of the Confereates under the direct supervision of the general-in-chief, Lt. Gen. Ulysses S. Grant.

on 6 november american voters will elect members of the house of representatives and the senate, which together are called congress.

both houses of congress are currently controlled by the republican party, which backs president donald trump.

the democrats think they can win control of the house of representatives this year by winning a majority of seats.

doing so would let them block or delay the president’s plans by refusing to enact them.

all 435 seats in the house of representatives are up for election.

if the democrats want to take control of the house by having the most seats, they’re going to have to claim at least 23 from the republicans.

graphic: the battle for the house of representatives

what are the reasons