What was the cause of Abolition of Slavery

Emancipation Proclamation

Explanation:

It was declared after the civil war when the North won and abolsished slavery. Other factors may have been the many marches, speeches, and defiancy, led by people like MLK.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

a peace conference held after the surrender of japan

an international conference held near the end of world war ii

a meeting of the victorious nations after the defeat of germany

a summit meeting between the united states and the soviet union