Why were some Tejano settlers unhappy

While Tejanos - Texans of Mexican descent - were an important faction in the fight for independence in 1836, the Texas Revolution was largely led by Anglo-American immigrants.

Explanation:

The Mexican government was concerned too many Americans were coming to Texas. This made the Americans unhappy. The Mexicans also said no new slavery would be allowed. Americans wanted to use slaves on their land.Tejanos are descendants of the first Spanish, Mexican and indigenous families on the Texas frontier. Very little is known about the role they played in the political, economic and military arenas of the revolution for Texas independence

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.