Who’s efforts in the 1940s and 1950s nearly eliminated polio?

The correct answer is "Jonas Salk".

Jonas Salk was an American virologist who developed one of the world's successful vaccines against Polio. He studied in the medical school of the University of New York. After deciding he would devote his further efforts to medical research, he goes on to work for Mount Sinai Hospital in 1939. He would develop the vaccine for polio during his time at this medical center.

abraham lincoln was the president of usa and he had asked the audience to make a pledge on equality.

his pledge was:

“it is my earnest desire to know the will of the providence.”

lincoln also had hatred for people who condoned and practiced slavery and so he pledged:

""and if i can learnt what it is i can do it"" this is another pledge by abraham to reassure the congregation on how to deal with the providence will.

explanation:

hope this !

hello! : )

i think a judge or jury, as they preside over the court and is the central figure in a trial.

hope this and i hope i answered in time!

good luck!

~ destiny ^_^