U.S.
Origins
The defenders of the Alamo were as varied as the accounts and legends that evolved from the siege. One with a fundamental knowledge of the event based on the stories and movies depicting the battle might assume that its population was made up of anglos who had a bone to pick with the Mexican dictatorship, or that they were men of war. However, the truth is that most of the men at the Alamo were farmers in their twenties. Not all were anglos, some were members of the hispanic populations of San Antonio and Laredo. Neither were they all from Texas. Besides Davy Crockett's men from Tennessee, others came from as far away as New York and Pennsylvania. Why did they travel so far? Perhaps the revolution in Texas evoked feelings much like that of the War for Independence did only fifty years earlier.
The largest group of defenders, not including Texians, were those from Louisiana. Then came Crockett's Band from Tennessee and their neighbors in Kentucky.
Of the 95 Texans at the Alamo, 40 came from Gonzales. Thirty-two of which rode through the Mexican lines under the cover of darkness after the siege had begun. Eleven men of San Antonio gave their lives, among these was James Bowie. Nacogdoches and Brazoria Counties both contributed 10 souls to the cause.
The Alamo defenders were not mercenaries, they were a legitimate army with assigned ranks made up of men who desired freedom from a dictatorial ruler who had declared martial law and abolished all power of the states of Mexico. The men's ages and backgrounds were not uniform and they came from near and far to make a stand. Their struggle has contributed much to Texan's unique identity.
Source: Richard J. Lindley III, Department of Geography Student Projects - University of Texas at Austin, Spring 1997.