Conversation so far:
what were two obstacles to texas becoming a state
Mexico wanted to keep Texas, and Martin Van Buren feared it would cause war. He also didn't want to add a new state to the Union that allowed slavery.
why was martin van buren against texas annexation
Martin Van Buren viewed Texas annexation as an immense political liability that would empower the anti-slavery northern Whig opposition.
when did Texas become admitted into the US as a state
Texas was admitted to the Union as the 28th state on December 29, 1845.
did the democrats agree with the annexation of texas
The leadership of both major U.S. political parties, the Democrats and the Whigs, opposed the introduction of Texas.

Question: how come
Self-contained rewrite: how come democrats and whigs both opposed the annexation of texas