I just wanted to point out that the numbers you gave for the u.s are all foreign deaths and not domestic deaths whereas the deaths caused by Stalin* are primarily domestic deaths.

A better answer would focus on domestic deaths in the u.s under each president, such as fatalities in the death camps America calls prisons, fatalities from lack of medicine, exposure, starvation, etc. Everything the U.S.S.R addressed to promote the general welfare of the Soviet peoples that the U.S.A failed and still fail to do to this day.