The southern states were very powerful in congress and slavery was still not seen as something that was wrong. The slave states felt they needed slaves for the economy and to keep growing the cotton, tobacco and rice..
It allowed slavery, but was with the union.
1850 Comprimise
Before becoming the US president Lincoln's position on slavery in Washington DC was similar to that of Henry Clay. As a matter of principle he favored emancipation in the capitol. On the matter of constitutional interpretation, he believed that the Federal government had the power to end slavery in Washington DC. With that said, Lincoln, as a matter of prudence argued that it was too risky to attempt, and unlikely to succeed.
The Compromise of 1850 addressed the issue of slavery in Washington, D.C., by allowing the continuation of slavery in the capital but banning the slave trade. This compromise aimed to appease both pro-slavery and anti-slavery factions, as it preserved the existing institution while responding to growing abolitionist sentiments. Additionally, it included provisions for the more stringent enforcement of the Fugitive Slave Act, which further heightened tensions between the North and South.
There is an underground passage in Washington DC. This is in place in case of an emergency so that the President and important staff can go there if the need arises.
Washington DC
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If I am correct, and I believe I am, the Compromise of 1850 ended the practice of slave auctions inside the borders of Washington DC.
Washington, DC
Washington DC
The abbreviation "DC" is postponed to "Washington" for two important resasons: [i] for locative indication of "District of Columbia"; and [ii] to distinguish Washington Sate of Washington City, the 42nd of the United Satate.
Washington - Baltimore Washington International, DC, USA (BWI) Washington - Washington - All Airports, DC, USA (WAS) Washington - Ronald Reagan National Airport, DC, USA (DCA) Washington - Washington Dulles, DC, USA (IAD)