The roman empire created the world’s first

a) irrigation system.
b) network of roads.
c) system of writing.
d) firefighting brigades.

The correct answer is letter D: firefighting brigades. The first brigade was created by Marcus Licinius Crassus who, together with 500 men, would run to burning buildings and bargained their way in, in exchange of putting out the fire. If the owner of the place refused to pay what they were asking for, they'd just leave the place burn to the ground. After that, Emperor Nero built a force that used to patroll the streets of Rome and that's basically how the Roman Empire created the world's first firefighting brigade.

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 !

answer; i believe the two groups were irish immigrants and chinese immigrants;