This engraved map was published in the Newark Daily Advertiser in 1845, while the U.S Senate was considering a resolution already adopted by the House of Representatives that would result in the annexation of the Republic of Texas into the United States. The map shows how widespread slavery was in that proposed state, the "free district" comprising just a tiny portion compared to the "slave district." This was an official map published by Congress, and the newspaper editorialized about it as follows:
No mere verbal description could give the reader so clear a conception of this shameless mockery on the part of the Texas scrip and slave-dealing speculation. The whole scheme is here exposed to the eye, at a glance.