The cause of the increasingly tense relations between the mexican government and the american residents in texas after 1830 was mainly the increasing american immigration, that brought with it many cultural and social conflicts, since the Mexican natives became the minority in Texas, reaching only 7800 against the 30,000 English-speaking inhabitants, bringing as a consequence a conflict for the independence of Texas and then the annexation to the United States of America.
Infectious diseases and colonization.
Sorry, I don't have an answer more specifc than that.
On February 25, 200–300 Mexican soldiers crossed the San Antonio River and took cover in abandoned shacks approximately 90 to 100 yards (82 to 91 m) from the Alamo walls. The soldiers intended to use the huts as cover to establish another artillery position, although many Texians assumed that they actually were launching an assault on the fort. Several men volunteered to burn the huts.To provide cover, the Alamo cannons fired grapeshot at the Mexican soldiers, and Crockett and his men fired rifles
The attacks of the Goths began in 247 A.D. and in 251 A.D. They lured the Roman army under the command of the Emperor Decius into a swampy region and defeated it. ... withdrew Roman troops from Dacia leaving it to the Goths. The Danube once again became the northern frontier of the Roman Empire in eastern Europe.
