The first major cause was the Industrial Revolution itself, which began in Great Britain but then quickly spread to the United States. The second was the factory system, which used a system of assembly lines to make production faster and more efficient than ever before
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The answer is : A
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Lincoln’s Emancipation Proclamation, which took effect in 1863, announced that all enslaved people held in the states “then in rebellion against the United States, shall be then, thenceforward, and forever free.”
On January 31, 1865, the House of Representatives passed the proposed amendment with a vote of 119-56, just over the required two-thirds majority. The following day, Lincoln approved a joint resolution of Congress submitting it to the state legislatures for ratification.
The congress, together with the president, decided the legality of slavery.
