Why were the Texans unhappy with Mexican rule

Texans were unhappy with Mexican rule because they were required to pay taxes.

Explanation:

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it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

explanation:

the tallest building in the western hemisphere and the sixth tallest building in the world