Scarce coast to coast map of the United States, showing a massive Texas and Upper California, both recently part of the United States, published in London in 1848.
Texas is shown 2 years prior to statehood, with a massive oversized northwestern extension into New Mexico Territory.
The rest of the west is "New California" (including New Mexico, Utah, Colorado, Nevada and Arizona), along with a massive Oregon Territory. Mythical Rio Buenaventura and Rio Sacramento are still shown.
Further north, the map includes an oversized Nebraska Territory, Dakota Territory and Wisconsin Territory.
This is the post-annexation Texas / pre-statehood configuration we have seen.