1. General James Wilkinson
Philip Nolan (1801)
A scientific expedition dispatched by President Thomas Jefferson. (1806)
General James Wilkinson
(1806)

2. In 1819, Dr. James Long and a force of fellow filibusters attempted to wrest Texas from Mexico. This endeavor apparently had the backing of a group of Natchez entrepreneurs who were upset over the passage of the Transcontinental Treaty of p. 57.

3. The Constitution of 1824

4. The Investigation and Report of Mier Y Terán
In order to evaluate how the national government might best deal with the troubles in Texas, Mexico dispatched Manuel de Mier y Terán, a high-ranking military officer and trained engineer, to the north. Crossing into Texas in 1828, Mier y Terán reported that:
The province was flooded with Anglo Americans
Nacogdoches had essentially become an American town
Prospects for assimilation of the Anglos into Mexican culture appeared dim
The Anglo settlements generally resisted obeying the colonization laws.
Mier y Terán report spurred the drafting and implementation of the Law of April 6, 1830.
p. 64.

5. The Law of April 6, 1830
The Law of April 6, 1830 intended to stop further immigration into Texas from the United States by declaring uncompleted empresario agreements as void, although Mier y Terán let stand as valid those contract belonging to men who had already brought 100 families.
Future American immigrants must not settle in any territory bordering the United States.
New presidio were established to check illegal immigration.
The Law banned further importation of slaves into Texas.
p. 64.