Following the results of the US elections, the situation looks like this:
The last seat in the Senate will also be given to the Democrats. The ratio will be 56 to 44, which will increase the Democrats' advantage to 12 seats.
To end the war with Iran:
In the past, Democrats were always one vote short. They will now have an advantage of 12 seats.
In the House of Representatives, the Democrats' advantage is also 83 seats.