alternatehistory.com

With a POD no earlier than 1789 (Washington’s Presidency) have a viable political party that is formally pro-expansionist. I don’t mean in terms of Manifest Destiny, but in terms of formally annexing as much territory around the world as possibly.

There was some Whig opposition to the Mexican American War (most notably, Abe Lincoln). The Spanish American war had detractors (most vocal during the occupation of the Philippines). Those were the two genuinely expansionist wars in the history of the US. And while both were overall broadly popular, all the major parties at any time were officially opposed to formal expansionism.

Viable is defined for our purposes will be regularly maintaining some presence in Congress.
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