this should help
https://learnodo-newtonic.com/industrial-revolution-inventions
<span>The 1861 Emancipation Manifesto proclaimed the emancipation of the serfs on private estates and of the domestic (household) serfs.</span>
When farmers’ incomes fell due to low prices in the 1920s, they <span>Sold land, a lot and generally headed into cities or to California as they were unable repay their loans.</span>
The best and most correct answer among the choices provided by your question is the second choice which is "railroad tracks."
<span>By 1860 the Midwest and the East were united by a network of railroad tracks.</span>
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Answer:
In economic terms the slave trade had become less important. There was no longer a need for large numbers of slaves to be imported to the British colonies. There was a world over-supply of sugar and British merchants had difficulties re-exporting it.
Explanation: