How and why did President Polk gain control over Texas?

In 1836 the battle of the Alamo happened and then the Texas revolution and Texas gained independence from Mexico, Polk then decided to add the state to the union as a slave state in response to a new free state and that decision started the Mexican american war. (1846-48)

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2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."