What caused tensions between the tejanos and Americans in Texas in the late 1820's?

Answer 1

1. In 1831, Mexico abolished slavery, following the lead of most western nations. This loss of unpaid labor, if actually enforced in Tejas, would have been a severe blow to the region's emerging cotton economy. It also reminded many transplanted citizens of the tolerant official view of slavery held by the United States.
2. The Mexican government, recognizing its diminished control in Tejas, abolished Immigration. The residents there, who had friends and relatives in the United States, were outraged.
3. As a further means to loosen the ties between the U.S. and Tejas, Mexico enacted heavy duties on the importation of foreign goods.
4. In 1833, General Antonio López de Santa Anna came to power in Mexico, pledging to consolidate power and strengthen national unity. The rise of a Mexican nationalist was viewed with alarm in the north, where the Texans preferred to continue their near autonomy.

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Answer 2

Slavery was one and mandatory tithing to the Catholic Church became another.