It increased the opportunity for failing to specialize
Answer:
Explanation:
In 1854, amid sectional tension over the future of slavery in the Western territories, Senator Stephen A. Douglas proposed the Kansas-Nebraska Act, which he believed would serve as a final compromise measure. Without the support of slave-state Senators, the likelihood of completing the railroad remained very low.
President Abraham Lincoln paved the way for abolishing slavery, in the year 1808 they stopped the transport of slaves from Africa to the US.
