No they are not, the United States controls the entirety of the Mississippi watershed, New Orleans and the Great Planes states, granting it control over the spine of the North American continent and the single largest area of farmland anywhere. It already is a superpower.
While this is true, I think it important to note several key factors:
A. The population of the RU is almost certainly lower than OTL US, even accounting for the territorial differences. Immigration is not as palatable, most of the country has been subjected to a brutal total war at one point or another, and mortality rates of the ethnic groups here called “Inferiors” is almost certainly higher than OTL.
B. There have been five great gold rushes (and one silver rush) in American history OTL:
1. The Carolina Gold Rush of 1799
2. The Georgia Gold Rush of 1828-1840s
3. The California Gold Rush of 1848-55
4. The Klondike and Alaska Gold Rushes of the 1890’s
5. The various minor rushes of Colorado, the Dakotas, and Nevada between 1880-1895
6. The Nevada and Colorado Silver Rushes of 1870-1890
Now the US benefited immensely from all of these OTL, growing the treasury and population rapidly while building up the area at a greatly accelerated rate. Here, the RU has only benefited from the last two (and peripherally from the Georgia one).
C. The US plunged nearly its entire GDP into economic expansion between 1790-1860. The military was tiny and government expenditures in general were very,
very small. Here, the various nations have been forced to spend on guns instead of butter much earlier. Now in some circumstances that can be remarkably stimulating, but here I suspect that it hasn’t been.
D. Finally, the RU does not yet have California. In addition to the obvious problems with the absence of a huge population center and breadbasket, it causes a knock-on effect in that none of the transcontinental railroads except OTL’s Great Northern make any sense to build. That means the Great Plains are going to be much less developed.
Although the potential is there, I would caution against assuming the RU is anywhere near as strong as the historical US at this time.