Okay, I have a possible map for the United States in 1950. The point of divergence is that Albert Sidney Johnston and his army side with the Confederacy during the Civil War, with California and Oregon succeeding and opening a much larger Western Front. He was considered the best Confederate general before Robert E. Lee emerged, so he could cause a lot of havoc in the West. The map is based on 1861 borders, which is why the states look different and why Virginia has West Virginia (in this timeline Virginia reclaims West Virginia and it is just a historical footnote).
Republic of Tejas (Yellow)
Consists of Texas and Oklahoma, which succeeded from the Confederacy after the discovery of oil in their states. Texas has always had an independent strain, and the discovery of vast oil fields and the good climate led to Texas becoming a major destination for immigration. The Native Americans of Oklahoma were also growing increasingly wealthy from oil projects and had a similar sentiment in favor of secession. Arizona and New Mexico joined Texas and New Mexico shortly afterwards because they were cut off from the rest of the Confederacy and had similar economic differences with the remainder of the Confederacy, being mining based economies.
As of 1950, the Port of Galveston handles the largest value of cargo in the world, exporting hundreds of thousands of barrels of oil a day. Tejas has a production of 1.3 million barrels of oil a day, making it one of the largest oil producers in the world. In a great irony, Tejas has better relations with the United States than the Confederacy, supplying most of America's petrochemical needs. There are talks between Tejas and the United States regarding the construction of a pipeline connecting the oil fields of Texas and Oklahoma with American industrial centers. However, the most efficient path must pass through the Confederacy, which is loath to help supply oil to their rival.
Republic of Pacifica (Green)
A second country established during the 1860s secession crisis, when Albert Sidney Johnston's armies sided with the Confederacy. After Union forces were mobilized against the Confederacy, Pacifica joined with the Confederacy in the war and quickly seized the Comstock Lode. Together with its West Coast ports, Pacifica played a major role in the secessionist war effort. After the war Nevada was ceded to it by the United States.
As of 1950, Pacifica currently has tensions with Tejas regarding the proposed construction of a hydroelectric dam at Glen Canyon, which may divert water away from Pacifica's own irrigation projects.
The Confederate States of America (Red)
Although the Confederacy won its independence during the Civil War with the United States, the Confederate economy has remained heavily centered around agriculture and related industries. Industrialization has been hampered by lack of natural resources and the reliance on slavery well into the 1890s, an economically obsolete and morally corrupt institution. Norfolk, Baltimore, and the former District of Columbia are among the most industrialized areas of the Confederacy.
The United States of America (Blue)
After its defeat in the Civil War, which saw the loss of Nevada and Maryland, the United States looked inwards. Secession is a constant threat to the stability of the country, with one state or another threatening to leave the Union every decade or so. The United States has not lost any states to secession since the end of the Civil War, but its legalization by the Supreme Court in Texas v. White has remained a constant danger to the unity of the nation.