The industrial revolution did.
In the beginning, the only perceived difference was that they were not Christians so they wanted to baptize them. After the industrial revolution, the European countries developed rapidly while African and Asian countries didn't and Europeans believed that this was due to their superior race so they decided to colonize them under the pretense that they would help them develop.
Answer:
the answer is option D.
Explanation: During the order of Emancipation proclamation the order to free slaves in Border slave states of the Union and the areas already under control of Union was not made by the President. This proclamation was only to free slaves from Confederate areas which were also rebel areas.
