Because he made the best toast.
Revivalists sent missionaries to convert Americans living in remote regions.
Adams sends people to negotiate peace
They travelled great distances by sea.
Mexico at first did not allow the people of Texas to own slaves. After winning independence and however, Texas allowed slavery. Once slavery was allowed, after a few years of independence, texas asked to enter the US as a slave state.
So Texas went from a territory of Mexico that had slavery banned to a state in the US with slavery (after independence)
hope this helps