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Description
About a month ago I had a sudden urge to jump on the manifesting-america-anywhere-but-west bandwagon on r/imaginarymaps and made this.

A portal opens in OTL Ann Arbor, Michigan, in 1800. The portal leads to the same place but in the Late Cretaceous, 66 million years ago. America subsequently gets the idea that it is their God-given duty to pacify and settle the lands on the other side of this portal (the Washtenaw Gate, as they call it) and this occupies most of their attention from then onwards. A luckier Napoleon doesn't sell Louisiana, and America stays more or less within their 1800 borders. After all, they have all the land they could ever want waiting for them through the gate...
With America busy, Mexico ends up absorbing Oregon, the Caribbean, and Florida and makes Lower Louisiana and several South American nations into client states. France spends most of the 19th century trying to conquer Europe more frequently and more zealously than they did OTL, and are only stopped when a puppet state they carved out of Germany leads a coalition against them in the 1890s and punishes them severely. Fascism (somewhat different from ours, but same name) takes hold in France in the late 1910s, and in the 1920s they and their allies overrun most of Europe with ideas of Latin racial superiority. Due to America not really caring, Soviet Russia has to defeat France by itself, and by 1933, France is in pieces, Russia is imploding, and the shiny new Union of Socialist European States is forcing itself onto the world stage.
The world of 2022 is polarised between Mexico And Friends and the USES' world-spanning alliance system of communist states, with the US being the most important neutral state. The world on the other side of the Washtenaw Gate is an interesting one, mainly because much of it is controlled by intelligent troodontids called the Kihan, who evolved in Asia. The US has accepted many refugees, especially persecuted minorities, throughout history because of it having a convenient dumping ground for them, and most non-US human states are descended from those refugees. Most of proto-North America is under US control, with Kihan states in the west and south. Of particular concern is the Šikīnye Empire, a Kihan state based in proto-Iran that has managed to reverse-engineer a huge amount of human tech (with a few innovations of their own) and explode across Eurasia.
The future looks uncertain, as the Mexican-European cold war heats up, and American scholars worry about the asteroid impact in Mexico that, pastside, doesn't seem to have happened yet.

Description
About a month ago I had a sudden urge to jump on the manifesting-america-anywhere-but-west bandwagon on r/imaginarymaps and made this.

A portal opens in OTL Ann Arbor, Michigan, in 1800. The portal leads to the same place but in the Late Cretaceous, 66 million years ago. America subsequently gets the idea that it is their God-given duty to pacify and settle the lands on the other side of this portal (the Washtenaw Gate, as they call it) and this occupies most of their attention from then onwards. A luckier Napoleon doesn't sell Louisiana, and America stays more or less within their 1800 borders. After all, they have all the land they could ever want waiting for them through the gate...
With America busy, Mexico ends up absorbing Oregon, the Caribbean, and Florida and makes Lower Louisiana and several South American nations into client states. France spends most of the 19th century trying to conquer Europe more frequently and more zealously than they did OTL, and are only stopped when a puppet state they carved out of Germany leads a coalition against them in the 1890s and punishes them severely. Fascism (somewhat different from ours, but same name) takes hold in France in the late 1910s, and in the 1920s they and their allies overrun most of Europe with ideas of Latin racial superiority. Due to America not really caring, Soviet Russia has to defeat France by itself, and by 1933, France is in pieces, Russia is imploding, and the shiny new Union of Socialist European States is forcing itself onto the world stage.
The world of 2022 is polarised between Mexico And Friends and the USES' world-spanning alliance system of communist states, with the US being the most important neutral state. The world on the other side of the Washtenaw Gate is an interesting one, mainly because much of it is controlled by intelligent troodontids called the Kihan, who evolved in Asia. The US has accepted many refugees, especially persecuted minorities, throughout history because of it having a convenient dumping ground for them, and most non-US human states are descended from those refugees. Most of proto-North America is under US control, with Kihan states in the west and south. Of particular concern is the Šikīnye Empire, a Kihan state based in proto-Iran that has managed to reverse-engineer a huge amount of human tech (with a few innovations of their own) and explode across Eurasia.
The future looks uncertain, as the Mexican-European cold war heats up, and American scholars worry about the asteroid impact in Mexico that, pastside, doesn't seem to have happened yet.