retrocession

1835 map showing Alexandria as part of original District of Columbia. (Source: Library of Congress)

The Alexandria Retrocession of 1846

We have the states of Maryland and Virginia to thank for the land that created Washington, D.C. It was through their cession of territory — 69 square miles from Maryland and 31 square miles from Virginia — that Congress was able to establish a permanent home for a federal government on the banks of the Potomac River in 1801. However, almost from day one, Virginia was looking for a way to get its land back. Four decades later, it finally did.